Genevieve Cogman's The Invisible Library
Well, this was a mostly entertaining and interesting book about a young (sort of?) woman, a Librarian at the titular Invisible Library, which exists outside of time. Her job is to enter different versions of the world to collect rare books. It's pretty cool. And then she gets a mentee and a weird new assignment--in an alternate London full of Fae and on the brink of chaos--that quickly turns dangerous, and it's all pretty fun, if occasionally overdone. It looks like this might be the start of a series, but not the one I want to read! I'm super interested in the Library, not in a detective solving crimes in an alternate version of London. That's been done, you know? I mean, this certainly hints at a greater mythology for the Library, so I assume we'll get some of that in the midst of magical historical crime solving, but still. B/B+.