Clay Jensen finds thirteen mysterious tapes on his doorstep. When he starts listening to them, he is suprised to hear Hannah Baker's voice, since she committed suicide recently. As he listens, he learns that the tapes reveal the thirteen reasons why Hannah committed suicide. The most shocking part is that he was one of the reasons, even though he was in love with her. Listening to these tapes could change how he views his classmates and how he remembers Hannah forever.