Thomas brings Eve back to the kitchen and seats her with his family, who all treat her as Thomas’s troubled sister, Emma. Eve forces herself to play along, lying that she was looking for tools, then improvising answers about moving out and apartment hunting. Jenny briefly destabilizes the performance by insisting Emma used to have a wrist tattoo, but Thomas and Newton quickly smooth it over. Fake Shylo obeys Thomas instead of Eve and reacts fearfully to her, reinforcing that even the dog belongs to Thomas’s version of reality.

During dinner, Paige keeps pressing Eve about “Charlotte,” the Portland ex who corresponds to Charlie in this false life. When the power goes out and Thomas leaves to get candles, Paige opens Eve’s favorite red wine and Eve notices that Paige is wearing Charlie’s brass locket, which has somehow vanished from Eve’s pocket. The sight triggers a rush of grief and anger, and Eve seizes Paige, holding a corkscrew to Paige’s throat while demanding to know where Charlie is. Thomas keeps insisting that Eve is Emma, blames missed medication, and orders the children upstairs.

Thomas tries to calm Eve and even starts to call Charlie, but Eve assumes he is calling for institutional help and forces him to stop. In the standoff, Paige suddenly stabs Eve in the thigh with a steak knife. In the chaotic struggle, the corkscrew ends up buried in Paige’s throat. Thomas drops to the floor and desperately tries to save Paige, but the bleeding does not stop. While Thomas calls for help, Eve pulls the knife from her leg, grabs the hammer she had hidden earlier, and tries to pry open the front door, only to discover it is still effectively locked from the outside.

When Thomas realizes Paige has died, his grief turns violent and he chases Eve upstairs. Eve reaches Alison’s room, where she briefly sees Alison in a blood-spattered nightgown apologizing before the vision vanishes. Thomas assaults Eve and nearly crushes her against the barred window, but Eve knees him, then drives the hammer into his face and tears open his cheek and jaw. Although Eve raises the hammer to finish him, Thomas’s broken pleading makes her stop. As Eve backs away, Thomas suddenly calls her Eve instead of Emma, suggesting his fabricated identity script is slipping.

Eve flees to the attic, hoping to escape through the small window onto the roof, but Thomas catches her again and drags her back. While strangling her, he rants in grandiose fragments about giving her life, sowing the forest, and building foundations, sounding less like a delusional husband and more like something older and stranger. Eve strikes Thomas with tire chains, then wraps the chains around his neck and demands Charlie’s whereabouts, but Thomas can only mutter fractured nonsense about the house and a labyrinth. Before Eve can finish him, two police officers arrive, tackle and handcuff her, and lead her out as paramedics rush inside. On the way out, Eve sees terrified Jenny, the house altered again, neighbors including Heather and Michael, and Alison standing restored at the forest’s edge; the officers ignore Eve’s warnings and lock her in a police van.