This book had a really interesting premise, I’m not sure I’ve read anything quite like it before. Even besides that, the concept of parallel worlds/lives is just plain fun.
Unfortunately, The Bookseller suffers from being kinda boring. It’s really hard to talk about the plot without giving too much away, so all I’ll say on that topic is this - it’s not poorly written, it’s just not engaging. Neither Kitty nor Katharyn’s lives are particularly interesting, and often feel like they’re building up to a revelation that never quite arrives. The rest of the characters - and especially their relationships - feel so cookie-cutter as to be almost unbelievable.
I wish I had more positive things to say about it. I did like the detail in the world building, and the way history was worked into the background. That was very neatly done. And when it’s all said and done, it’s not a bad book, it’s just not good.