Clay is given a cassette made before Hannah before she kills herself. She lists 13 people who led her to her death. Clay rushes to find out what his role was in her decision. He finds that small actions can bring about great consequences, for good and for bad. 
 Helped me realize how much are small actions can matter. Have a greater understanding of how small derogatory comments can harm someone. Also, that small positive actions such as listening and saying something nice can help an injured person.