The protagonist of the movie, named Theo Conroy, is a successful screenwriter who has made a lot of money from his blockbuster horror movie. However, he is struggling to come up with fresh ideas for the sequel. So, he decides to take a break from his stressful life and rent a remote house in the Alps with his wife, Susanna, and their six-year-old daughter, Ella.
Initially, things seem good for the family, as they enjoy the picturesque setting and the tranquility of the countryside. However, as the days pass, strange occurrences begin to take place in the house that leave Theo feeling disoriented and paranoid. He starts to have nightmares and experiences inexplicable visions of his past.
Moreover, he notices that the house is full of strange architectural anomalies that defy logic and physics. Rooms appear and disappear, furniture moves on its own, and doors lead to nowhere. Susanna seems to be oblivious to these occurrences, which frustrates Theo even more.
As the days progress, Theo's grip on reality loosens, and he becomes increasingly obsessed with uncovering the mysteries of the house. He finds clues in his own past, which hint that the house may be a manifestation of his own guilt over his failed marriage and his past infidelities.
The climax of the movie involves a terrifying sequence of events that reveal the true nature of the house and the fate of Theo's family. The conclusion is haunting and thought-provoking, leaving the viewer to question what is real and what is imagined.