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.

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.

Jealousy and gossip take a toll on Hannah's relationships. As Alex struggles with feelings regret, the guys pressure Clay into getting drunk.

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.

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.

Another student sabotages Hannah during a class project. Clay's nightmares about Hannah spill over into the daytime.

A distraught Hannah gets a ride home from the party. Jessica's behavior grows increasingly erratic, and Clay learns the truth behind a tragedy.

Clay and Hannah grow closer. While Clay spends a heartbraking night listening to his tape with Tony, tensions boil over at Bryce's house.

Hannah winds up at a party after an argument with her parents. The students are served with subpoenas, and Justin wrestles with conflicting loyalties.

Hannah seeks help from Mr. Porter, the school counselor. Clay plays the new tape for Tony and weighs what to do next.

Courtney makes a brave decision. Clay's memories of Hannah drive a wedge between him and Skye. Someone trashes the yearbook office.

Clay hides a secret from his parents. Concerned about his reputation, Marcus lies in court. Jessica and Alex skip school together.

Tyler and Cyrus embrace their outsider status. Alex fights to recover his lost memories. Ryan and Mrs. Baker look to Hannah's poems for clues.

Clay tries to figure out where the Polaroids were taken. Justin shows up at school. Zach's revelation about Hannah takes everyone by surprise.

Alex blows up at Bryce. Someone blackmails Marcus. Clay testifies about a night he and Hannah spent together. Jessica experiences a flashback.

When Hannah's parents come under scrutiny, Jessica reaches out to Mrs. Baker. Justin struggles to stay clean. Clay reconnects with Skye.

Tyler goes out with Cyrus's sister. Chloe confronts Bryce about the tapes. Jess wonders if she's ready to date again. Mr. Porter wrestles with regret.

Tony opens up about his past. Sheri devises a plan to get into the clubhouse. Mr. Porter tries to help Justin. Zach and Bryce butt heads.

One month later, Hannah's loved ones celebrate her life and find comfort in each other. Meanwhile, a brutal assault pushes one student over the edge.