Hope Baker, a quiet girl suffering from depression and bullying has only reason to keep her alive and that's her best friend Luke Hemmings. But when that reason isn't strong enough, she commits suicide. Before she does, she records 13 memo's, which had 13 reasons why she loved him and kept her alive.

12-year-old Madeline Dawson feels alone at her own home. Her cruel stepfather and wicked stepbrothers make her life a living hell and her mother hasn't spent quality time with her in over ten years. Her only two refuges are her monthly sleepovers at her grandma's apartment and the end-of-year school trip to Ottawa. But when a small lie causes her mother to take away both of her outlets, Madeline feels lost in a world with no love.

Four girls whose clique falls apart after the disappearance of their queen bee, Alison DiLaurentis. One year later, they begin receiving messages from a mysterious figure using the name "A" who threatens to expose their secrets. At first they think it's Alison herself, but after she is found dead, the girls realize that someone else knows their secrets, â€" including long-hidden ones they thought only Alison knew.