The morning after trivia night, Detective-Sergeant Adrian Quinlan says police are collecting footage, photos, forensic evidence, and statements from all 132 parents who attended. He makes clear that the police suspect a coordinated lie and intend to learn exactly what happened on the balcony.

In a private hospital room, Madeline waits for ankle surgery while Ed sits beside her, distressed by the idea of lying to police. Madeline says he can tell the truth if he wants, but Ed argues that this is not gossip or schoolyard snitching; it is a criminal investigation. Madeline recalls the chaotic aftermath: Celeste screaming, Bonnie sobbing, Nathan swearing, Jane bleeding, Renata yelling at the fighting fathers, and multiple guests ending up injured, alongside Perry’s death.

Madeline replays the central revelations of the night. Jane identified Perry as Saxon Banks, Perry dismissed what he had done as meaningless, and Perry hit Celeste in front of everyone. Madeline is overwhelmed by guilt for not recognizing Celeste’s abuse sooner and wonders whether Celeste ever tried to confide in Madeline but was drowned out by Madeline’s own chatter.

Ed says Bonnie has already delivered a vegetarian lasagna and spoken to a journalist, which increases his anxiety. Madeline insists Perry’s fall was an accident, but Ed questions why they should lie for Bonnie. Madeline thinks Renata’s denial began because Perry’s cruelty and infidelity reminded Renata of Geoff’s betrayal, but Madeline also believes the women’s silence came from a deeper instinct: protecting Bonnie and refusing to punish a woman for the accidental death of a violent man.

Nathan arrives with flowers and says Abigail wants to move back home to help Madeline, possibly because she misses her mother. Nathan then asks to speak with Madeline and Ed about the night before. He reveals that Bonnie grew up watching her father violently abuse her mother and that Bonnie has been diagnosed with post-traumatic stress. Nathan pleads that Bonnie is a good person and a devoted mother who snapped when she saw Perry hit Celeste.

Madeline understands Nathan is asking for help not just as Bonnie’s husband but as someone still tied to Madeline’s family history. Despite Ed’s anguish, Madeline decides that Bonnie has become part of her extended family and says they will tell police they saw nothing. Ed, unable to accept the choice, leaves the room without looking back, while Quinlan’s closing statement confirms that police know someone is lying.