Clay Jensen returns home from school to find a strange package with his name on it lying on his porch. Inside he discovers several cassette tapes recorded by Hannah Baker, his classmate and crush, who committed suicide two weeks earlier. Hannah's voice explains that there are 13 reasons she decided to end her life. Clay is one of them. If he listens, he'll find out why.
Clay spends the night crisscrossing his town with Hannah as his guide. He becomes a first-hand witness to Hannah's pain, and learns the truth about himself - a truth he never wanted to face.