I saw "Once Upon a Tome" by Oliver Darkshire recommended if you liked the tweets by the author about the rare bookselling business.
I hadn't heard of the tweets before, but the book sounded interesting, so I bought it. And it was interesting - the book is a swift read as well. Some of the stereotypes of the various kinds of customers that rare booksellers attract are a little trite, and the story itself didn't go anywhere much.
But a pleasant and funny book nonetheless.