I Was Here by Gayle Forman (hardcover)

When her best friend, Meg, commits suicide by drinking a bottle of industrial-strength cleaner alone in a motel room, Cody is understandably shocked and devastated. She and Meg shared everything—so how did she miss the signs of Meg's depression? But when Cody travels to Meg’s college town to pack up the belongings left behind, she discovers that there’s a lot that Meg never told her. About her old roommates, the sort of people Cody never would have met in her dead-end small town in Washington. About Ben McAllister, the boy with a guitar and a sneer, and some secrets of his own. And about an encrypted computer file that Cody can’t open—until she does, and suddenly everything Cody thought she knew about her best friend’s death gets thrown into question.