Camino Island by John Grisham

A gang of thieves stage a daring heist from a secure vault deep below Princeton University’s Firestone Library. Their loot is priceless, but Princeton has insured it for twenty-five million dollars.

Bruce Cable, a known womanizer, owns a popular bookstore in the sleepy resort town of Santa Rosa on Camino Island in Florida. He makes his real money, though, as a prominent dealer in rare books. Very few people know that he occasionally dabbles in the black market of stolen books and manuscripts.  His girlfriend is an antiques dealer whose store is next door to the bookstore.

Mercer Mann is a young novelist with a severe case of writer’s block who has recently been laid off from her teaching position.  She used to spend summers on Camino Island when her grandmother was alive but has not been back in years.  She is approached by an elegant, mysterious woman working for an even more mysterious company. A generous offer of money convinces Mercer to go undercover and infiltrate Bruce Cable’s circle of literary friends, ideally getting close enough to him to learn his secrets.

To do this, Mercer frequents the bookstore.  She was supposed to visit when her book came out, but thinking no one really wanted to buy the book, she cancelled her tour just before going back to the island.  She strikes up a friendship with Cable, who wants to get her into his bed.  Eventually Mercer learns far too much, and there’s trouble in paradise, FBI involvement, and double-dealing.