13 Reasons Why by Jay Asher is a young adult novel published in 2007 about a high school student, Hannah Baker, who commits suicide and leaves behind a series of cassette tapes explaining the thirteen reasons why. The tapes are mailed to the thirteen people she blames for her death, and her classmate Clay Jensen is the first to receive them, listening to her story as he navigates his town. The book explores themes of bullying, sexual assault, and mental health.