After a teenage girl's perplexing suicide, a classmate receives a series of tapes that unravel the mystery of her tragic choice.

1. Tape 1, Side A 54m As the school mourns the death of Hannah Baker, her friend Clay receives a box of tapes with messages she recorded before she committed suicide.

2. Tape 1, Side B 52m Hannah makes friends with Jessica and Alex, two other new students. Justin doesn't show up at school, and Hannah's mother finds something troubling.

3. Tape 2, Side A 57m Jealousy and gossip take a toll on Hannah's relationships. As Alex struggles with feelings of regret, the guys pressure Clay into getting drunk.

4. Tape 2, Side B 57m Hannah thinks someone is stalking her and sets a trap. Hannah's mother confronts the principal, and Clay strikes back at someone who wronged Hannah.

5. Tape 3, Side A 59m Hannah and Clay connect at the school dance, but a crass rumor ruins the mood. Clay takes Courtney to visit Hannah's grave.

6. Tape 3, Side B 52m Hannah's date on Valentine's Day doesn't go as planned. Alex gets in a big fight at school and has to face the honor board.

7. Tape 4, Side A 54m Another student sabotages Hannah during a class project. Clay's nightmares about Hannah spill over into the daytime.

8. Tape 4, Side B 54m Inspired by a friend’s poetry reading, Hannah pours her heart out. Tony confides in Clay about the night of Hannah's death.

9. Tape 5, Side A 59m Hannah witnesses a traumatic event at a summertime party. Clay tries to reason with Justin, and Marcus warns him that the worst is yet to come.

10. Tape 5, Side B 50m A distraught Hannah gets a ride home from the party. Jessica's behavior grows increasingly erratic, and Clay learns the truth behind a tragedy.

11. Tape 6, Side A 54m Clay and Hannah grow closer. While Clay spends a heartbreaking night listening to his tape with Tony, tensions boil over at Bryce's house.

12. Tape 6, Side B 62m Hannah winds up at a party after an argument with her parents. The students are served with subpoenas, and Justin wrestles with conflicting loyalties.