After Thomas is brought back inside from the snow, Eve and Charlie sit with him by the fire while he recovers. Thomas apologizes for frightening Eve and explains that he used to sleepwalk and have night terrors as a child. He says his parents treated those episodes as demonic attacks, but once he learned the medical explanation for his sleep disorders in high school, the episodes stopped. Thomas suggests that being back in his childhood home may have triggered the relapse and asks Eve and Charlie not to tell his family what happened.

When Eve and then Charlie press Thomas about his earlier question about whether they had noticed anything strange in the house, Thomas finally agrees to explain. He says the first major incident happened when he was eight and his older sister Alison suddenly insisted that familiar objects in the house had changed. First she claimed a white coatrack used to be gray, then she became convinced a painting had appeared in her room overnight even though the family insisted it had always been there.

Thomas says Alison's experience quickly worsened. According to Thomas, Alison believed the wallpaper, floors, furniture, and even the house's layout were changing around her, with old rooms disappearing and new ones appearing. Instead of getting Alison medical help, Thomas's deeply religious parents framed her experience as satanic interference, told her to pray, and blamed her when that failed. When they found Alison carving symbols like the ones Thomas had shown Eve earlier, they punished her and kept her inside the house.

Thomas goes on to describe the most disturbing change: Alison's memories began to shift, and she came to believe that their parents and other familiar people had been altered or replaced by impostors. She began testing family members with questions about the past and begged them to believe her, but Thomas says no one truly helped her. He admits that he still feels guilty and that part of his reason for returning was to find closure, though being back has only left him wondering whether Alison was mentally ill or whether something genuinely incomprehensible happened there.

After Thomas goes upstairs, Charlie tells Eve that Alison's story sounds like psychosis caused or worsened by terrible parenting. Eve, however, remains deeply unsettled and keeps wondering why Thomas returned and what ultimately became of Alison. When Eve and Charlie finally go to bed, Shylo is already there. Charlie and the dog fall asleep quickly, but Eve lies awake replaying the night's strange events until exhaustion finally overtakes her.