Hmm. Looks like I'm responsible for the genre's demise then...
I read it earlier in the year, and my thoughts at the time (with a potential spoiler deleted): Lightweight fantasy with the premise of an enormous magical library which sends out people into “alternate” worlds to obtain specific books by any means possible. Our heroine, Irene, is sent on a mission into a steampunkish Victorian London where the fae are important and chaos reigns, and is thrown into dangers from the Library’s defector and now arch-enemy, with mechanical centipedes, electricity-driven alligators, suffocating whitefish, hansom cabs, zeppelins, Liechtenstein, vampires and a Sherlock Holmes figure. Lots of parentheses and a would-be humorous voice, with simple word use, clause construction and linear plot suitable for YA. Reads like a downmarket Ben Aaronovitch – less funny, less interesting, less dramatic. Not bad, but not particularly memorable.
But then, truth be told, I'm not a great fan of gothic or steampunk really, so perhaps the genre is safe after all.