Clay Jensen is a high school student who finds a mysterious box on his doorstep. Inside, there are thirteen cassette tapes recorded by Hannah Baker, a classmate who sadly ended her life. As Clay listens to the tapes, he discovers that Hannah left a message for each person she believes played a part in her tragic choice. Through her voice, Clay learns about her pain, the secrets of their school, and the true impact that small actions can have on others. It is a serious and touching story about the importance of being kind.