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A covert mission
A royal demand
And a race against time

The fourth title in Genevieve Cogman's witty and wonderful The Invisible Library series, The Lost Plot is an action-packed literary adventure.

In a 1930s-esque Chicago, Prohibition is in force, fedoras, flapper dresses and tommy guns are in fashion, and intrigue is afoot. Intrepid Librarians Irene and Kai find themselves caught in the middle of a dragon vs dragon contest. It seems a young librarian has become tangled in this conflict, and if they can't extricate him there could be serious political repercussions for the mysterious Library. And, as the balance of power across mighty factions hangs in the balance, this could even trigger war.

Irene and Kai find themselves trapped in a race against time (and dragons) to procure a rare book. They'll face gangsters, blackmail and fiendish security systems. And if this doesn't end well, it could have dire consequences for Irene's job. And, incidentally, for her life . . .

352 pages, Kindle Edition

First published November 30, 2017

574 people are currently reading
12.9k people want to read

About the author

Genevieve Cogman

54books4,476followers
Genevieve Cogman got started on Tolkien and Sherlock Holmes at an early age, and has never looked back. But on a perhaps more prosaic note, she has an MSC in Statistics with Medical Applications and has wielded this in an assortment of jobs: clinical coder, data analyst and classifications specialist. Although The Invisible Library is her debut novel, she has also previously worked as a freelance roleplaying game writer. Genevieve Cogman’s hobbies include patchwork, beading, knitting and gaming, and she lives in the north of England.

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Displaying 1 - 30 of 1,395 reviews
Profile Image for Phrynne.
3,857 reviews2,597 followers
May 23, 2018
Another excellent entry in this very enjoyable series. And what a sweet ending. It left me with a smile on my face!

I have loved the concept of a hidden library between many different worlds since I read book one and now it is even better because we have dragons! In this book there are a number of dragons doing dragony things and when two adult dragons fight in the air over the Hudson River watch out!

I like that the main character is a librarian called Irene. This conjures up a vision of a stuffy middle aged lady in a twin set. Nothing could be further from the truth as this Irene is young, smart and able to get herself out of all kinds of dangerous situations. She likes dragons too:)

A quick check shows me that there is a book 5 in the future some time. I am looking forward to it already.
Profile Image for Melindam.
844 reviews381 followers
October 8, 2022
".....And if X gives Qing Song the book that lets him get Minister Zhao’s position, then Librarians become tools for hire. They become servants. And they become generally known as allies of the dragons, which means they’re automatically enemies of the Fae. Not to mention that if we support one dragon family or faction, then we make enemies of the others. The Library survives in the middle. We are not on anyone’s side. If X exists and has done what Jin Zhi says they have, then X has just put Librarians in danger across all the alternate worlds."

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Profile Image for Richard Derus.
3,621 reviews2,187 followers
February 19, 2019
Real Rating: 4.75* of five

The Publisher Says: After being commissioned to find a rare book, Librarian Irene and her assistant, Kai, head to Prohibition-era New York and are thrust into the middle of a political fight with dragons, mobsters, and Fae.

In a 1920s-esque New York, Prohibition is in force; fedoras, flapper dresses, and tommy guns are in fashion: and intrigue is afoot. Intrepid Librarians Irene and Kai find themselves caught in the middle of a dragon political contest. It seems a young Librarian has become tangled in this conflict, and if they can't extricate him, there could be serious repercussions for the mysterious Library. And, as the balance of power across mighty factions hangs in the balance, this could even trigger war.

Irene and Kai are locked in a race against time (and dragons) to procure a rare book. They'll face gangsters, blackmail, and the Library's own Internal Affairs department. And if it doesn't end well, it could have dire consequences on Irene's job. And, incidentally, on her life...

My Review: Quite extraordinary. This is a high-stakes story within the Invisible Library series. Many, many things have changed since book one and in this story the changes truly come home to roost in the attic. Action, excitement, and several passages of astonishing violence are the key drivers of events down surprising channels.

It isn't often that I finish a series read, immediately procure the next, and devour that one in a day. I did that for this series because I am besotted with the idea of the Library and its multiverse-trotting spy/burglar/diplomats the Librarians. I am even, if you can believe this!, completely okay with the presence of magic in the series.

I know, right?!

I who lift my brow, crinkle my nose, draw my lips into a sneer, at the merest whiff of majgickq, actually *approve* of the system invented and presented in this series. It's actually inexplicable to me that I am not having literary hives every time the Language is used and at each Fae sighting. What has happened to me? I'm putting it down to the revolting fact, recently revealed to me, that I with *gag* Tom Cruise *retch*, which blow to my self-esteem causes me spiritual pain.

The story in this book is, from the opening scene, one of peril and menace to Irene. She is most often alone to face her adversaries. Kai is, as a developing theme in the series, going to have to learn to take action on his own behalf. Irene's worries that she isn't teaching him the skills she possesses so much as grooming him as her sidekick have been woven through the stories. It's a sign of the character's deeply seated identity, created by a talented and careful author. I buy into the characters's reality in this really quite daft alternative view of reality because Author Cogman spent the time to think through these small moments of self-reflection.

The main action takes place in a Prohibition-like New York after Irene and Kai land in the ruins of a library in Boston. Readers of the previous book will appreciate the emotional impact of this venue, and readers in general will share the appalled horrified revulsion that Kai and Irene express at the idea of a soul so bereft of respect as to perpetrate vandalism on a library. (As an aside, I note that just published which non-fictional take on the subject I ended up abandoning as it was too painful to continue reading.)

The local mob boss, Giorgio Rossi aka George Ross, has a lady sidekick-cum-enforcer, Lily. Lily knows who, more accurately what, Kai is on sight. That's because Lily is Fae, and despite her chosen position as murderous muscle for the mob, is really the brains of the crime boss's operations. Irene's somewhat bizarre (and wholly unintentional) cover identity as an English crime boss visiting New York to drum up new business piques Lily's interest.

Crime boss Irene is hunting a vanished Librarian straight into the clutches of two dragons operating without sanction in this bizarre, lawless New York. They're aiming to win an internal political battle by supplying their dragon queen with a special alternative edition of an ancient Chinese novel. (She's interested in a re-read of this novel, a fondly remembered diverting entertainment from her past. That procuring this book for her amusement causes numerous deaths and a vicious war between her subordinates is...uninteresting.) Irene's hunted Librarian, Evariste, is doing his dead-level best to accommodate one of the dragons by procuring the book because his daughter is being held hostage by the dragon's clever henchman. Kai and Evariste, separated from Irene, go off and procure the desired book...but who receives it and how aren't in the least sure until the moment the event occurs.

The climax of the hunt for the book, for Evariste, and for justice (and Justice) takes place in the Court of the Dragon Queen. As always when the extremely Order-centered dragons are involved, there is a price to pay for the lies one tells, and a price to pay for telling the clear, unmuddied truth. Justice and fairness each have their innings, though neither one takes the field in unsullied glory at the end of the proceedings. The guilty...everyone is guilty, that's the nature of the world, the multiverse in fact, but here we mean "those whose actions and inactions caused irreparable harm" by it...suffer, and the wronged are made as whole as Justice can make them. Irene is required to suffer her personal agonies in the search for and service of Justice served to violators of Order.

But there is, as there always is, a reason in Author Cogman's relentless and grinding tale of Truth's victims. And it makes the ending of this book so very, very special. I seldom laugh with exuberant happiness as I read endings. That is exactly what happened here.

Author Cogman:
Profile Image for Magdalena aka A Bookaholic Swede.
2,021 reviews869 followers
February 10, 2018
After the last books thrilling plot was I eagerly awaiting the next book in this series. The Lost Plot takes librarians Irene and Kai to an alternative world set in 1930s America with gangsters (and dragons). They have to save the life of a librarian who has been caught up in a fight between two dragons. And, Irene and Kai most try to fix this situation since librarians have to stay outside conflicts like this.

Now, this book was absolutely alright to read. I love Genevieve Cogman's writing style, the humor, and the action and of course the supercool Invisible Library. However, I just want to say that there were two things that just made this book a little less interesting to read and that was that my favorite character, besides Irene, was pretty much absent all through the book. Yes, Vale is not in this book much. Which is perhaps logical since Irene and Kai are in another alt. world than Vale's. However, that doesn't mean that I don't miss him and that I didn't spend the whole book waiting for him to show up. Also, the romantic turn in this book is one that I was not at all thrilled about. I'm not sure I will handle this pairing in the next book. It just feels, not interesting.

The plot, for the most part, was good with two dragons competing against each other. Nevertheless, There were moments when I felt that my interest would drop throughout the story. Irene's usually brightened the dull moments with some wisecrack comments or thoughts. However, I must admit that looking back do I realize that my heart was not really there. That the story just barely worked for me. It could be because of the big confrontation in the previous book and the fact that this dragon centralized storyline just didn't do the trick for me.

However, I will still read the next book in this series and I do hope to see more of Vane in it.

I want to thank Berkley Publishing Group for providing me with a free copy through NetGalley for an honest review!
Profile Image for Carole (Carole's Random Life).
1,937 reviews589 followers
January 6, 2018
This review can also be found at .

I had such a good time reading this book! This is the fourth book in The Invisible Library series and while it tells its own story, I do think that this series is best if read in order. One thing that I love about this series is that each installment can be completely unique and the types of worlds that they visit really has no limits. This was a very strong story that was incredibly entertaining from beginning to end.

Irene finds herself in a difficult situation once again. She is approached by a dragon regarding a very important contest for a rare book. The Library does not get involved in dragon politics and must maintain their neutrality so Irene reports the incident to her superiors. Irene is given the assignment of investigating the actions of another Librarian and to find out what is going on with this situation.

Irene and Kai find themselves in a New York reminiscent of the 1920s complete with gangsters and other colorful individuals. Irene is in trouble right away once she enters the city and soon finds herself at odds with the local police. She must deal with them along with the local gangsters in addition to figuring out what is going on with the dragons and the other Librarian.

This was my favorite book in the series thus far. I was completely charmed by the whole story. I like how Irene is able to think quickly and can seem to get herself out of almost any situation. Kai spent a lot of time away from Irene in this book but we get to see that he is equally capable. I really like both of these characters a lot. They are both willing to make sacrifices if necessary in order to make sure that the right thing is done. Not to mention that dragons play a dominant role in this story which I found really interesting.

I would recommend this series to others. I found myself swept away in a wonderfully crafted world filled with a variety of interesting characters. I can't wait to read more of this delightful series!

I received an advance reader edition of this book from Berkley Publishing Group via NetGalley.

Initial Thoughts
This was such a fun book! This installment takes Irene and Kai to New York in a period reminisent of the 1920's complete with gangsters. There wasn't a minute of boring in this book and I was highly entertained the whole time I was reading. Things look pretty dire for a while in this book but it is always interesting to see what Irene can come up with to everyone out of trouble.
Profile Image for Mogsy.
2,218 reviews2,746 followers
January 25, 2018
4 of 5 stars at The BiblioSanctum

Now that the Invisible Library series has become firmly established, the storylines are just getting better and better. Thematically, The Lost Plot is more mysterious and adventurous, drawing heavily from Dragon vs. Fae politics, and there are also strong attempts to involve as many world-building elements as possible. That said though, I do feel this installment takes a step away from series arc that has been developing for the last three books; the plot of this one is a lot more “standalone� than the others, which might make it a good jumping on point for new readers, but of course I would still highly recommend starting from the beginning if you can.

The Lost Plot once again follows protagonist Irene Winters, an agent of the secret organization known as the Invisible Library whose members are tasked with traveling to alternate worlds to procure rare books (and yes, sometimes that means stealing them). When the book begins, Irene is offered a business proposal by a mysterious stranger. The would-be client, clearly a dragon, wishes to pay handsomely for her services to obtain a rare copy of Journey to the West, one of Chinese literature’s greatest classics. However, because of the Invisible Library’s official mandate to remain neutral in matters regarding the Dragons and the Fae, Irene’s first instinct is to decline.

Only, it turns out that not all Librarians are as responsible as she is when it comes to playing by the rules. From her contact, Irene finds out that one of her colleagues had accepted a similar deal to find the book from another dragon, and if this information were to get out, it could cause some serious conflict with the Fae and possibly spark an all-out war. Unable to walk away now, Irene turns to her apprentice Kai for help, and together they travel to an alternate world reminiscent of 1920’s New York to seek out the Librarian who has put all their futures in jeopardy.

The Lost Plot might be them most entertaining book of the series so far. It’s nice to see the story taking full advantage of its premise, making use of the interdimensional library aspect to transport readers to strange new worlds—or, in this case, exploring interesting historical periods. Anything is possible in this series, and this time, Irene and Kai’s adventures take them to a time of fedoras, Prohibition, and tommy gun-toting gangsters. The Roaring Twenties are one of the most iconic decades in American history, and you’ll find all its hallmarks in this novel, from the instantly recognizable fashion styles to the clandestine speakeasies and all that jazz. As if attempting to extract the Library from the middle of a long-standing Dragon vs. Faerie rivalry weren’t enough, our characters also find themselves having to deal with interfering police chiefs and greedy mob bosses who are all trying to get a slice of the action. From beginning to end, this book was non-stop and fast-paced fun.

I also liked how this novel featured a dragon-centric storyline, which of course raises some important questions about Kai’s role in the Library. The ending with the courtroom-like setting and suspense was almost more than I could bear. However, as someone who has followed this series since the beginning, I noticed too that the focus has shifted slightly away from the conflicts of the previous novels, with the scope widening to encompass the Invisible Library’s role and exploring its significance in this world. This was something I’d wanted for a long time, so I was quite happy to see The Lost Plot go down this path. That said, there are some trade-offs. Here you will find little development in the areas regarding Alberich or the mystery behind Irene’s parentage, for example, and for those answers, I suppose we’ll have to wait for a future sequel. Vale fans should also be forewarned that he does not feature much in this novel, a point to which I will admit to a twinge of disappointment myself, since I’ve grown to like his character a lot. But oh well, you win some, you lose some.

All in all, The Lost Plot was another exciting and satisfying sequel which reminds me once again why I’m glad to be reading this series. There’s a reason why I keep coming back for more. If you’ve been enjoying the mysteries of the Invisible Library and the interdimensional adventures of its agents thus far, then you’ll want to pick this one up too.
Profile Image for jess ~has abandoned GR~.
556 reviews117 followers
December 23, 2017
I love these books.


This is a rare situation where each book in the series is better than the last.

What begins as a straightforward action adventure story becomes more of a mystery that is not easily solved. Dragon politics has taken a nasty turn, and evidence points to the involvement of a librarian, violating their neutrality pledge. Irene and Kai must find this rogue librarian and try to restore balance, but must do so without the institutional cover of the library; if they are discovered, they're on their own.

The setting is a slightly more dramatized version of prohibition-era America, with powerful mob bosses, weakened police departments, and entirely too many guns everywhere.

Once again, even though Irene and Kai have some level of what could be considered magical abilities, their main asset is their cleverness and bravery.

My only complaint is that there is not nearly enough Inspector Vale in this book. He is delightful.

received via Netgalley

I apologize for the weak review, but man, having a newborn is SO MUCH WORK. <3
Profile Image for Auntie Terror.
468 reviews112 followers
September 27, 2020
So I get speakeasies, but no bigbands? Tsk, tsk, tsk...

I've always had my misgivings about the more "chick-lit-ty" moments/episodes in the books of this series - and this one wasn't an exception. The romantic/sexual undertones of the relationship between Irene and her apprentice, Kai, were, in my mind, always a bit uncalled-for, mostly due to the social relation of teacher and pupil (as well as one being a dragon prince who is at once a lot older and probably comparatively younger than his human teacher, and who was only recently deeply traumatized). But they were there, and at least didn't feel completely forced (though there seemed other characters with greater chemistry). They culminated in the two literally getting a room at Vale's place after Kai had valiantly severed his ties to the Library shortly beforehand to save its neutrality and Irene's standing at another dragon's court, in this novel.
Personally, I'd have preferred for this romance to be tragically cut short before it really began by Kai's choice. This would also have made it a greater gesture which would have felt more in tone with how I'd perceived the character in his more serious moments. But perhaps there's a not just soppy reason for the author to keep him around in some capacity.

What I really, really enjoyed was the more detailed glances this story allowed into dragon society, showing that the side of "order" is hardly the side of the "good guys" either (in case any readers had had any illusions about that left). Any dnd-players will, of course, long have known that lawful isn't necessarily followed by good, as neither of the other two are. And we get them all neatly displayed in the main factions in this series.
I also enjoyed the setting a lot and would have wished for some more "secenery" to play a role in the story. What I missed most, were "sound-bits" - there should have been a lot more jazz, to put it bluntly.

All in all, this one felt a bit weaker than its predecessors. But it was the usual fun and quick read, and I'll continue the series in time.
This entire review has been hidden because of spoilers.
Profile Image for Wanda Pedersen.
2,198 reviews484 followers
April 26, 2019
2019 Re-read

When life gets complicated, my reading needs simplify. Ms. Cogman’s Invisible Library series had seen me through a challenging week of no running water and cat care duties.

Ah, the dragon intrigue volume! This is where the rubber meets the road for Irene and Kai. Not to mention whether the Invisible Library will be able to maintain it’s neutrality. Plenty of mysterious happenings, complete with gangsters and over-head dragon duels.

This is the “diplomacy is hard� volume too. As Irene notes at one point, “And there was another elephant in the room. There were so many elephants in the room that it was getting positively crowded.�

Ms. Cogman, I will read as many of these adventures as you choose to write. I hope there are plans for several more, as this is too good a fantasy world for me to abandon it happily.

Original review:

I admit I am very much a fan of Irene Winters and the Invisible Library series. So much so that I will actually be purchasing a copy of this, book 4, to become part of my Nursing Home Collection (all those books that will make the transition with me to said nursing home when the time do come).

I read too damn fast�The Lost Plot went by much too quickly. It is action-packed, putting Irene in many tight spots, between gangsters, plotting dragons, and unpredictable fae assassins. Luckily, she and Kai have been through several of these rodeos before and they are pretty good at judging what their partner will do.

The ending, while obviously leading us on towards book 5, was nearly perfect! I know that I’ve previously been a fan of Irene + Vale, but after book 4, I am really shipping Irene and Kai. It’s a woman’s prerogative to change her mind!

Ms. Cogman, bring on book 5! And could I be lucky enough that you are planning more?
Profile Image for Jenna.
216 reviews11 followers
February 4, 2018
Update: 3.5 stars. Still really good, but it feels slightly different from the other books in the series. Though I loved the progression in Irene and Kai's relationship!

I'm so excited for this! There's now a cover for it, and the title has been revealed!



The summary is intriguing:

"Their fourth adventure takes our intrepid pair of Librarians to a 1930s-esque Chicago. Prohibition is in force, fedoras, flapper dresses and tommyguns are in fashion, and intrigue is afoot. Irene and Kai find themselves in a race against time (and dragons) to procure a rare book whose discovery could have serious political repercussions for Kai's people - and whose loss could have dire consequences for Irene's job. Oh, and also possibly for her life . . ." ()
484 reviews101 followers
May 3, 2023
This book was well written, but not my cup of tea.
Profile Image for Maria V. Snyder.
Author75 books17.3k followers
October 5, 2024
Another adventure for Irene and Kai! This series is going strong so far. The narration is excellent as always.
Profile Image for Alex Cantone.
Author3 books43 followers
October 17, 2019
(Irene) looked around the room they were standing in one last time. It was stacked full of westerns from A-658. The covers were festooned with lurid pictures of stern-jawed cowboys, rearing horses and women falling out of bodices. She hoped she never had to go anywhere like that. Horses weren’t one of her enthusiasms�

In a universe where worlds are dominated by the forces of order (dragons) and chaos (the fey), the Invisible Library holds the balance of power through remaining impartial, its operatives traverse to distant worlds via libraries to return ancient tomes to the library for safe keeping, stacks of books forming “wards� against evil, and invoking the Language for use against mortals, animals, inanimate objects or their surroundings.

Irene Winters is librarian-in-residence in Victorian London, with her apprentice, Kai, youngest son of the Dragon King of the Eastern Ocean (Ao Guang). In The Lost Plot she is summons to the library for a covert mission: the chief advisor of the (dragon) Queen of the Southern Lands has been assassinated and two candidates are vying to be appointed his successor: Jin Zhi and Qing Song. To prove their worthiness, each has to seek a rare book to bring to the Queen, without breaking the rules of engaging outside help. But Irene learns that one of the librarians has gone missing, after reaching the library then returning to one of the worlds. How he got there in the first place is shrouded in mystery.

With only a short timeframe, the world to which Irene and Kai traverse in search of the missing librarian is 1930’s Boston where prohibition, bootlegging and speakeasy’s reign supreme. Their plans are soon thrown into turmoil, first by gangsters, then the police.

‘I can pay, you know,� Irene offered. She was trying to work out who these men were working for. Were they Qing Song’s minions, random gangsters, specific gangsters, or undercover police? So many enemies, so little time.

Readers are often asked to suspend belief but Genevieve Cogman’s books make it easy. What I like most is they are ORIGINAL, not some rehashed fairy tale or Greek legend. The characters are well-described from their clothes to their moods and proclivities, there is a hint of romance between the main characters without overpowering the story. Throughout the narrative is littered with self-effacing humour as Irene uses her wits and powers of the library to evade or stay one step ahead of the opposition.

She jumped for the hole in the ceiling, grabbing hold of it and, with some gasping and straining, she pulled herself up and through. Her old gymnastics coach might give her a few marks for effort, but would take several thousand off for lack of elegance.

The middle is a bit muddled, but as the chase reaches its climax with a battle between dragons, Irene muses: She occasionally daydreamed about being the sort of character in a story who could faint and leave everyone else to sort things out. But that wasn’t going to happen.

I suggest starting with the earlier ones, but each story is complete in itself.
Profile Image for Robin (Bridge Four).
1,862 reviews1,641 followers
November 1, 2018
3.5 prohibitive stars

Every book the in the invisible library series is a story in and of itself. You almost don’t even have to read them in order and from what I can see so far you could maybe even get away with skipping one and then jumping back in at a later point so far. I say this because I think that is why I don’t have a stronger emotional connection to the characters yet. It feels almost like a new story every time starting from scratch than a series where you are building from book to book.

Irene and Kia need to find a librarian who might have gotten in a little over their heads and is using their Library skills to get involved with Dragon politics. This is bad since the Library is supposed to remain neutral and thus stays out of all of that. We are transported to a roaring 1920s world during prohibition to look for the Librarian in question and a book in the middle of this mess.

I enjoyed that it was just Kai and Irene in this book. I like Vale but I’m really pulling for Kia in a who gets Irene situation at the moment. Vale is a great Sherlock Holmes type of character but, well, he isn’t a dragon so�.*shrugs* #teamkai all the way here. Still it is all Kia all the time in The Lost Plot and there will be some consequences if they get caught by the Dragons since Irene and Kia’s relationship could be frowned upon too.

I also like the world that we land in with all the gangsters, dirty cops, speakeasies and tommy guns. It is a very parodied up version of the time I think. It’s light and fun and after some of the seriousness of the last book The Lost Plot is almost like a filler read or a short story off to the side. There is one big development off at the end but for the most part there is really no movement on any of the bigger plots surrounding the Library or Irene. After the reveals of the last story I was hoping to follow up on a few of the twists involved.

I really want to meet Irene’s parents and shouldn’t Irene possibly talk to her superior about a few of the bombs dropped by the Libraries #1 most wanted? Irene kissed Vale in the last book and Kia said they would talk about their future but there is never a conversation and well Vale was out of the entire picture in this story so there is nothing there either.

I like the stories but I’m longing for some personal relationship developments to happen sometime. Sooner rather than later would be preferable. It will be interesting to see what happens in the next book since it looks like Irene, Kia and Vale will be featured and working together.
Profile Image for Jacob Sebæk.
211 reviews8 followers
February 26, 2018


Just as we´re getting used to books gone missing, it is happening to Librarians as well �
And, “who ´re you gonna call �? Irene!�

After an installment # three which showed a wee bit weak in the storyline, Genevieve Cogman (and Irene) is doing a worthy come-back.

Lots of action, intrigue and fight-to-the-end-for-honor takes place in Chicago and New York during prohibition at a pace only fit for well-shaped dragons.
When we previously came to believe that the Dragon race were the upholders of Order, as opposed to the Chaos of the Fae, it now turns out we were maybe not told the full story.
There are rotten apples in politics everywhere, dragon kingdoms included, and it is up to Irene to navigate very delicately not to compromise the neutrality of The Library.

A well written forth episode in the life of Irene the Librarian, who will escape the monsters in the prologue �
Profile Image for All Things Urban Fantasy.
1,921 reviews618 followers
March 7, 2018
Review courtesy of .

The Invisible Library series consistently provides an entertaining and enjoyable reading experience. I love Irene and Kai, and I love the concept of the Library. While THE LOST PLOT felt like a side quest to the main, overarching plot of the series (no super evil librarians in sight here, or questions answered from previous books), it was still a great deal of fun to read.

THE LOST PLOT was full of danger around every corner for Irene and Kai, and I can honestly say I felt a little stressed out at times, trying to figure out how Irene was going to talk her way out of certain situations. She remains as capable and creative as ever, though, something that I very much appreciate about her character. Plus, she gets to play a lady gangster in a 1920s-esque New York, how badass is that?!

This book, while it felt a little like a detour from the main plot of Alberich trying to destroy the Library, still developed Irene and Kai as characters and developed their relationship in a way I was not really expecting. While they didn't get as much page time together as I would have liked, and I'm not 100% sure I love the way the relationship is going, I still liked the resolution at the end of the book.

All in all, THE LOST PLOT is an excellent installment in The Invisible Library series. This book also would work well as a stand alone, so readers new to the series could definitely jump in here without needing too much backstory. However, I do recommend the series as a whole!

Sexual content: Kissing
Profile Image for Maria Dimitrova.
746 reviews146 followers
October 28, 2018
Buddy read over at BB&B

The Invisible Library is one of those series that get better with each new instalment. The style evolves, the story gets better and the characters develop over time. In the beginning both Irene and Kai were a bit two-dimensional but over the last 3 books they've fleshed out into genuine sentient beings. I particularly like the change in Irene, whos whole priority system has changed now that she has some real meaningful connections with other beings. I blame Vale for that change most of all even if he played little role in this book. Despite him missing for pretty much the entire book, I could feel his influence every time Irene doubted her motives and chose to help her fellow librarian instead of thinking only about the Library's reputation. And that ending... well let's just say I have high hopes for the next book relationship wise. I do hope we'll get more of Vale in the next one though. I did miss him.
Profile Image for Fedra.
546 reviews110 followers
November 28, 2019
"You've for a real gift for words, Librarian."
"I read a lot, Irene admitted. "It's an addiction."

Είναι γεγονός πως τα βιβλία της "Invisible Library" είναι πράγματι εθιστικά! Αυτό το άκουσα σε audiobook, και το απόλαυσα ακόμα περισσότερο!

Τι; δεν ξεκινήσατε ακόμα την σειρά; Ενήλικοι πρωταγωνιστές με δράση YA, παράλληλοι κόσμοι και βιβλιοθηκάριοι κατάσκοποι 🔍🕵�
So many enemies, so little time

Αν και έλειπε ένας από τους βασικούς πρωταγωνιστές, έχω την εντύπωση πως είχε λίγο λιγότερη δράση, η οποία έχω παρατηρήσει τελευταία πως με κουράζει όταν παρατραβάει. Οπότε συνολικά 4 αστεράκια γιατί ξέρω πως μπορεί και καλύτερα! Δεν θα αργήσω να πιάσω στα χέρια μου το πέμπτο της σειράς... 👀
Profile Image for ☕️Kimberly  (Caffeinated Reviewer).
3,427 reviews763 followers
January 9, 2018
Vampires, fae, and dragons all give Irene fits in The Lost Plot. Two dragons are tasked with a quest. The one who completes it gains favor with the Queen, and the one who does not facesa disgrace that will require sacrifice to atone. When a new Librarianfinds himself tangled up in their quest to retrieve a book, Irene and her young dragon apprentice Kai must travel to an alternate 1920s New York to save him and protect the Libraries neutrality. Once again, Cogman pulled me in as we traveled to this alternate world with gangsters, flapper dresses, and prohibition to face a ruthless dragon determined to win.

From magic to worldbuilding Cogman holds me spellbound every time I step into the InvisibleLibrary series. I love the idea of alternate worlds. Some are filled with chaos and others order. I can just picturethe portals through libraries and the great library itself. A trip to security was fascinatingas the inner workings of the library itself are still quite a mystery. Each piece of knowledge we gain in the series is a treat.

I enjoy spending timewith Irene Winters. Her ability to access situations, devise plans and tapdance in high court never cease to amaze me. I loved meeting the Dragon Queen and picturedan Alice in Wonderland type court. I kept waitingfor someone to shout, "Off with her head!"

We see some developmentbetweenKai and Irene. I wouldn't call it a romance, and it is just a side thread to their friendship and partnership. I pictureIrene with a much stronger, older man like a certain detective on Baker Street perhaps. Only time will tell.
Profile Image for Elizabeth McCoy.
Author42 books45 followers
February 9, 2017
All evidence points to this being a great book. [/in-joke]
Profile Image for Milou.
367 reviews9 followers
March 28, 2018
This is yet another great continuation of a wonderful series. Cogman has created such a fascinating world, with endless possibilities... and in exploring this further she never disappoints.

This time around we travel to New York in the 1930s, complete with mobsters, guns, booze and dragon politics. In all her stories so far Cogman draws on the cliches, but still managing to create an unique world out of them. In doing this she makes the setting instantly recognizable but still incredibly interesting.

And as always, Irene is a wonderful main character. She is brilliant and kick ass, being able to get herself out of any tricky situation using a combination of common sense, wit, daring, persuasion/the Language or just well aimed foot. In this story she gets to shine as a crime lord... something she does suspiciously well.

The only thing stopping this from getting the full 5 star rating is the relatively tame climax compared to the epicness that was book three. But dragons...

Another point of note which might disappoint is that we see very little of the Fae, and also Vale doesn't really feature in this book. But dragons.

Overall, this book is fast paced, action packed and just a lot of fun. If you have not started this series yet, do yourself a favour and pick up The Invisible Library as soon as you can.

By the way, did I mention dragons?

4.5*
Profile Image for Sahitya.
1,147 reviews244 followers
October 2, 2018
This book was on all of my anticipated books lists of 2018 last year but I just lost track of it among all the other hyped novels, but I'm so glad I finally got the chance to get to it. Though I didn't plan this as part of my Five Star Readathon, I thought this would be a perfect book for the "Old Anticipated Book" challenge and it did not disappoint.

It's so much fun to see Irene in her element again. She is so calm, cool, collected and resourceful - it's just damn impressive. Her quick thinking in extremely tricky situations is always a delight to read and I love how she takes charge and everyone automatically listens to her, because she is just that assertive. Despite getting into all kinds of trouble, there is never any question that she is loyal to the Library but I admire that she still tries to make sure there is as less collateral damage as possible. But in this book, we also see a vulnerable side to her, especially when she sees the destruction of an entire library in Boston or while she is struggling with PTSD from the fiery ending of The Burning Page. It was nice to see that despite her confident persona, she is still human.

While the original trilogy was mostly about Irene and Kai trying to steal books and simultaneously dodging the all powerful rogue Librarian, this book finally gives us a better insight into the dragons - how their worlds and courts work, the various rulers and their politics and how best to deal with them. Pitting Irene against two competing dragon lords made for a very exciting story, because I really wanted to see how she was going to outmanuever them all. The setting of the story in 1920s Jazz and Prohibition Era America was a masterstroke - I love the descriptions of Boston and New York and the style and culture of the people. Having dragons, fae and librarians mixed up with police and gangsters made the whole ride quite thrilling. And I have to mention, Irene makes for an excellent badass mob boss.

Irene's relationship with Kai also goes through a lot in this book. Her struggle to remain neutral and not favor the dragons, while also finally acknowledging that she did indeed care for him was done really well. After all that happened in the first trilogy, I thought we would never see their relationship progress beyond friendship, but was I glad to be dismissed of that notion. This is one of the slowest burn ships you will ever read and I have to give it to the author that even now, at the end of the fourth book, she only gives us a possibility but no confirmation. I really hope we'll see more progress on that in the next installment. I really did miss Vale a lot in this book and I wish the 5th book will have more of the three of them.

This is an excellent series of books that any avid reader in love with the written word and a penchant for adventure will enjoy. And I'm even more excited because I got approved for the ARC of the next installment The Mortal Word and I'm ready for some more adventures.
Profile Image for Marc *Dark Reader with a Thousand Young! Iä!*.
1,298 reviews280 followers
February 27, 2023
Cogman already proved that her series has staying power, and at this point each additional book is an added treat. In some ways this was the best one yet; the action was snappier and the new continental setting of 1920's New York was a welcome departure from the thus-far Euro-centric multiverse saga. Gangsters! Prohibition! Molls! Tommy guns! Bathtub gin! Oh, and dragons and wolves.

Irene Winters is an incredibly British protagonist. I can't not hear a Brit accent while reading her thoughts and dialogue. The story acknowledges this in her inability to produce a believable American accent, despite her otherwise stellar social infiltration skills. She is one of my favorite flawed modern heroes.

I almost gave the book an extra review star, just for being so fun. I did not, because too often the deep dive discussions of dragon court politics and dragon ways of thinking verged awfully close to tedium, rescued in the nick of time by some explosion, gunshot, or surprise appearance. Add the A-Few-Good-Men-style climax and I just couldn't do it. Still, this is a joyful series that bridges my usual aversion to urban fantasy (which is only one possible categorization for this series).

****

UPDATE: Good news! I am DNF'ing this series! Not because I don't like it, but just because it's not quite my bag (fae; it's the fae), and I'm satisfied to leave off at this point. I even got so far as to borrow the next book from my public library and had it in my home for a couple of weeks before I decided to cut and run. This represents great personal growth in reading choices. It was not that long ago that I hesitated to try a new series because once I started I felt compelled to read the entire thing. Yay, me.

Taking a 2.5-year break from the series probably helped too.
Profile Image for Mary Catelli.
Author54 books196 followers
January 16, 2018
Book 4 of the Invisible Library series. Spoilers ahead

Irene tries to get a book in a fair book exchange, and finds herself in a lair of vampires. Extricating herself, she meets up with a dragon who tries to make a deal. And notes this was carefully timed to ensure that Kai would not be with her.

When Kai returns early, he can tell her some things, but exposes her to danger because now the other dragon knows.

Consequences touch on Irene's mysterious past, taking the train from Boston to New York, appropriate attire, a newspaper account of a master hypnotist, Irene's losing her voice, a lot of bath-tub gin, a fae not involved in their problems intentionally, a copy of The Journey to the West, an unexpected daughter, a dead mentor, and more.
Profile Image for Deanna.
999 reviews66 followers
January 14, 2023
Barely 3 stars.

This loses a star for a tediously repetitive, lengthy middle, unmediated by the choice of a story world setting analogous to prohibition-era NYC, and peopled by flat, dimestore characters from the gangster and NYPD populations.

Though there’s plenty of action, it’s a pointless merry go round of Irene and Kai, together or separately, repeatedly being captured by and escaping from various gangsters/cops/dragon. All this in and out does very little to advance or deepen the story, which is a pretty thin plot at its foundation.

This is a skippable entry in the series.

Profile Image for Sotiria Lazaridou.
634 reviews53 followers
February 9, 2025
4.5�

the book follows Irene, a librarian and secret agent for the Library, as she embarks on a mission that takes her to an alternate version of 1920s Chicago. in this world, powerful crime syndicates control much of the city and Irene is tasked with recovering a stolen book that could have dangerous consequences for the multiverse. alongside her loyal assistant Kai, she must navigate a web of intrigue, power struggles and unexpected alliances. the stakes are high as Irene uncovers more about the mysterious forces at play, while trying to prevent a catastrophic event.

it continues the mix of adventure, mystery and intrigue that fans of theseries have come to love. the plot takes readers on a thrilling ride through a vivid and dangerous world, filled with tension and twists that keep the pages turning. Irene’s character is as resourceful as ever and her evolving relationship with Kai adds depth to the story. the atmosphere of 1920s Chicago is rich and immersive, providing a fresh backdrop to the series.

the pacing is strong and it generally delivers an engaging and satisfying read for those who enjoy a blend of fantasy, detective work and action. ultimately, the book captures the essence of the series with its unique world-building and compelling central characters.
Profile Image for Beth The Vampire.
339 reviews23 followers
March 2, 2018
*ACTUAL RATING 3.5 STARS*

I’ve had to have a long think about this one.

This series has had highs and lows, with The Masked City a massive disappointment after the joys of the first book in the series, and then returning with a vengeance with The Burning Page. The settings of these books is what makes them, and in a Library where you can enter any number of alternate worlds, the possibilities are endless. The setting for The Lost Plot is 1920s America during prohibition. Great, huh?

My main problem was that the entire wider world was almost ignored. Previously, Irene had become enmeshed in the world around her, but I felt that this book could have happened anywhere, at anytime. It was mostly overlooked, other than small things that Irene giving a speech at a pro-prohibition rally, and how Irene had to dress, but otherwise I felt very disconnected from it. Previously the worlds have been so lovingly described, but here it was just kind of…abandoned.

While the book did focus on Irene’s duty as a Librarian, which involves stealing books particular to a world’s time and place, the context was very different. See, there are Fae and Dragons on the sides of chaos and magic, respectively. The Library remains neutral. The story was very heavily focused on Dragon politics, and two members of the royal family fighting over a book they were tasked to retrieve. Despite rules that say the Dragons cannot seek outside help, of course they break them, and hire someone from the Library, thereby breaching its neutrality. Irene was tasked with tracking down the Librarian involved, against her own peril, and trying to prevent a universal incident.

It’s not that the story is bad, not at all, but it is so big it takes up everything else. There is no time for world building, no time for the Library; it’s all about politics. And then it took a convenient incident at the end to really resolve everything. The twist was not actually that surprising either. This is also the first time in all of the books so far that Irene has not been in scenes and they are from the point of view of her apprentice, and Dragon royalty, Kai. It stood out a lot because Irene is the protagonist, and the narrative (while third person) is told with her flare, her personality, and it fell flat when Kai took over, because the narrative could not be the same. Because the characters split up, the reader needed to know what both of them were doing, but it came at the expense of how the whole book was written.

There is so much about this series that I love. The idea of the Library is just pure magic, and I love Irene as a charcter. The Language (used by Librarians to change perceptions and alter the world around them) was not overly used…although it can be a convenient out at times. Kai and Irene’s relationship is really sweet and believable, based on respect and faith, not physical attraction and that unbelievable love that makes you roll your eyes. I just think the story was convoluted, focused too much on politics, and the world building really did get left behind.
Profile Image for Lauren.
951 reviews924 followers
February 22, 2019
*minor spoilers*

3.75 stars

Hmmm...so this was the fourth instalment of The Invisible Library series by Genevieve Cogman and whilst I did really enjoy this book (it was witty and all very prim and proper), I didn't love it (like I did the first two).

I think the main reason for this was because there were quite a few characters who I love which didn't feature in this book at all :( For example: the Sherlock Holmes-like Peregrine Vale, the charming yet slightly creepy fae, Lord Silver, and yes, even the very sinister, flesh-wearing Alberich was missing (just a note: I do not LOVE Alberich) but I really wanted an arch nemesis in the book and we didn't get one.

I didn't feel as tense whilst reading this book as I have with the others where quite a few gruesome murders occurred nor did I feel a strong attachment to the new characters in this book (Qing Song, Jin Zhu, Hu, Lily, George Ross, Evariste.) They were all a bit 'meh' and I didn't feel as though enough of their backgrounds were explored. I would have preferred a more in-depth insight into Lily's background as she would have been a very interesting character; however, she remains George's gun-wielding moll without much substance.

As for Qing Song and Jin Zhu - they are both dragons who are rivals in a competition to become the Queen of the Southern Lands' new ambassador since the previous one has been assassinated, and their task is to retrieve a book all about dragon politics. Hence Irene and Kai's arrival in 1920s America. I did enjoy the description of prohibition America and the conversations which ensued between the various mobsters (ooh, and I loved how Irene escaped from Captain Venner!) but I just didn't feel as excited or invested as I did with Venice (location in The Masked City).

I definitely do think the absence of certain characters affected my overall enjoyment of The Lost Plot. I was really disappointed Vale and Lord Silver didn't make an appearance and I hope Cogman's next instalment focuses on them. A lot. The Lost Plot was all about the dragons so I want the next book to be Sherlock Holmes meets Fae Lord!

Hopefully my Christmas wish will come true!
This entire review has been hidden because of spoilers.
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