I picked this one up because it's a prop in the show I'm rehearsing, so my expectations were pretty minimal. That said, I enjoyed it and read it in three days which tells you that it's fun and not very deep.
The main character, and narrator, is Lark Dodge, the owner of a bookstore which requires amazingingly little of her time (sometimes she or her friend Bonnie dust a shelf or two, maybe a book is ordered). I enjoyed both Lark's narrator's voice and her as a character, so I'd be willing to read another of her adventures.
The central mystery was generally well constructed although it seemed to wrap up rather abruptly. Sort of "and now we know this fact, and now we know this fact, and now --- problem solved!!" I actually thought for a moment that this was a fake, first ending for a bigger reveal, but it wasn't. On the other hand, many mysteries reveal the villain and then end, so it was nice to have some thoughtful play out.