Midnight at the Bright Ideas Bookstore by Matthew Sullivan

Lydia Smith lives her life hiding in plain sight. A clerk at the Bright Ideas Bookstore, she keeps a meticulously crafted existence among her beloved books, eccentric colleagues, and the BookFrogs—the lost and lonely regulars who spend every day marauding the store’s overwhelmed shelves.

But when Joey Molina, a young, beguiling BookFrog, kills himself in the bookstore, Lydia’s life comes unglued. Always Joey’s favorite bookseller, Lydia has inherited his meagre worldly possessions. Trinkets and books; the detritus of a lonely man. But when Lydia flips through his books she finds them defaced in ways both disturbing and inexplicable. They reveal the psyche of a young man on the verge of an emotional reckoning. And they seem to contain a hidden message. What did Joey know? And what does it have to do with Lydia? 

 An enjoyably twisty story with quirky characters.  The second half was better than the first, but it still wasn't a book that grabbed me.  A nice enough easy read.