Clay Jensen returns home from school one day to find a mysterious box with his name on it, outside his front door. Inside he discovers a series of cassette tapes recorded by Hannah Baker - his classmate and crush. Only, she committed suicide two weeks earlier. On the first tape, Hannah explains that there are 13 reasons why she did what she did - and Clay is one of them. If he listens, Clay will find out how he made the list - what he hears will change his life forever.
Clay reçoit treize cassettes enregistrées par Hannah Baker avant qu'elle ne se suicide. Elle parle de treize personnes impliquées dans sa vie, amies ou ennemies, et qui ont compté dans sa décision. D'abord choqué, Clay se laisse porter par la voix d'Hannah, au fil de ses émotions.