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 and Clay connect at the school dance, but a crass rumor ruins the mood. Clay takes Courtney to visit Hannah's grave.

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

Inspired by a friend's poetry reading, Hannah pours her heart out. Tony confides in Clay about the night of Hannah's death.

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.

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

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

Worried about threats against them, Alex and Clay urge Jessica to testify about Bryce. Clay enlists Tony's help to find a potential witness.

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.

Threats against Clay and the others escalate. Tyler faces disciplinary action. Justin testifies about Bryce, putting his own future at risk.

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.

The cops question Clay about Bryce's disappearance. Clay remembers the aftermath of Spring Fling, when he raced to cover Tyler's tracks and met Ani.

After Tyler admits he still has a gun, the group keeps tabs on him at school. But their worry deepens when they learn he had a motive to kill Bryce.

The police bring in Tony for questioning. At Bryce's funeral, Ani uncovers two damning secrets.

The police interrogate Justin and Clay about the night Clay pulled a gun on Bryce. Clay discovers that Ani and Bryce's bond ran deeper than he realized.

Mr. Porter interviews students about Clay, who pleads his innocence to Mrs. Walker. Learning Porter counseled Bryce, Clay and Ani question his motives.

The cops name Clay as a person of interest in the murder. Ani catches Justin in a lie after learning Bryce bailed him out of a dangerous situation.

As the cops close in on Clay -- their main suspect -- violent confrontations at the homecoming game expose that everyone had a reason to kill Bryce.

The pressure of Clay’s arrest leads his friends to make risky decisions, and the full story of the brawl that erupted at homecoming emerges.

Clay is released on bail, Ani puts a plan to exonerate him into action, and the truth about Bryce's murder finally comes to light.

The police question Tyler about the guns, leaving the friends rattled. Winston transfers to Liberty High after getting expelled from Hillcrest.

After an incident at school, Clay thinks someone's trying to set him up. Zach and Clay land in hot water during a college tour.

The Jensens make the boys take a drug test. When the Liberty parents learn about an upcoming party, Clay suspects that they're tracking the students.

Clay's mental health continues to decline as the friends wrestle with difficult emotions during their college admissions interviews.

In the wake of the lockdown, the school is on edge — and a troubling abuse of power pushes the students to take action.

When the dean begins a new investigation and threatens to cancel prom, the friends decide to confide in their parents ... but not about everything.

Strengthened by the struggles they've endured, the friends say goodbye to high school and look toward the future.