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sci-fi isn't my usual to-go genre, but there was still the history buff in me that adored this. regan and elliot's characters are both well-developed, with a clear backstory and personalities that don't drag on throughout the story. though they're not flawless or without their faults, they are relatable and we get a clear understanding of where they stand early on in the book, which clears up confusion afterward.

anyway, the plot - it's this dystopian world where kids are born with the glitcher gene in their DNA. a glitcher is someone who is able to travel seamlessly through time. only one in a half million have it in their DNA, so thereafter they are admitted to one of the glitch academies around the world, which specialize in preserving the narratives of their own countries. this is where we are introduced to one of our protagonists; regan fitz; her mom is the commander in chief of her glitch academy, so naturally she's expected to follow in her footsteps. however, she drastically fails her practice simulation of abraham lincoln's assassination, which prepares her for real missions where she has to root out the butterflies, aka the glitchers' main adversaries who seek to change history instead of preserving it. here, we also meet our other protagonist, elliot mason, regan's worst archenemy. the two squabble and end up finding a letter that goes against everything their faction stands for - which of course results in an unlikely duo teaming up to save the day. fast-paced and witty, martin's middle grade novel is sure to be a delight for all lovers of sci-fi and time travel.