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.
If you're affected by any of the issues raised in Thirteen Reasons Why, click below for a list of UK-based support organisations that can help.