Clay Jensen returns home from school one day to find a mysterious box, with his name on it, lying on the porch. Inside he discovers 13 cassette tapes recorded by Hannah Baker — his classmate — who committed suicide two weeks earlier. On tape, Hannah explains that there are thirteen reasons why she did what she did — and Clay is one of them. If he listens, he'll find out how he made the list — and it'll change Clay's life forever.