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I was trying to describe this series to a friend and came up with a cozy, mixed with Slow Horses and the Folly series. Maybe? Whatever it is, it's got enough "something" to keep me reading and reaching for the next one.

There's a lot of esoteric trivia dumped into these books - in this case, the "hidden" (or paved over) rivers in London and how London itself has changed over the years. I'll confess I spent far too much time tracing the routes and places that get mentioned. If you're interested, there's a lot about them online. Beyond that, there's a mystery with the answer being somewhat clouded, and the murder not being a suspect you'd consider.