Thirteen Reasons Why (stylized as TH1RTEEN R3ASONS WHY) is a 2007 young-adult fiction novel written by Jay Asher. The book was published by RazorBill, a young adult imprint of Penguin Books. The paperback edition hit #1 on the New York Times best-seller list in July 2011.
Clay Jensen, a quiet, shy high school student, returns home from school one day to find a package from an anonymous person sitting on his doorstep. He discovers that it is a shoe box containing seven cassette tapes recorded by the late Hannah Baker, his classmate and crush who recently committed suicide by drug overdose. The tapes were initially mailed to one classmate with instructions to pass them from one student to another, starting from the one involved in the first story to the last. On the tapes, Hannah explains to twelve people how they played a role in her death, by giving thirteen reasons explaining why she took her life. Hannah has given a second set of tapes to one of their classmates and warns the people on the tapes that if they do not pass on the tapes, the second set will be leaked to the entire student body.