Elodie January, a 22-year-old Australian woman, lives with her six-year-old son, Jude, and her husband, Bren, in an old Victorian house in Farrows, Virginia. Bren is in the midst of an ambitious renovation he insists on completing himself. Elodie is 16 weeks pregnant with their second child, a pregnancy she engineered by lying to Bren about birth control. The novel traces the rapid unraveling of her carefully constructed life as secrets surface from the house, from Bren, and from Elodie herself.
From the opening pages, Elodie's relationship with Jude is defined by exhaustion and desperate love. He is small for his age, prone to violent meltdowns, and resistant to nearly everything she asks. The only reliable strategy she has for gaining his cooperation is framing instructions as games, particularly Simon Says. Jude insists he hears something breathing inside the walls, a claim Elodie dismisses but cannot shake from her own mind. He tells her the house thinks she is "bad."
Bren is cheerful, devoted, and seemingly uncomplicated. His parents were killed in a mass shooting when he was 10, and his older sister, Ava, raised him afterward. His deepest desire is to replicate the family he lost, and he treats the house as a sacred project. Elodie's dependence on him is total: She has no money of her own, no job, and no connections in Virginia beyond his family. They have lived in the country for only four months.
Flashbacks reveal what Elodie is hiding. When she was eight, she was told to bathe her two-year-old brother while her mother started dinner. The toddler bit her, and Elodie stormed out in tears, intending to return after calming herself. She lost track of time. Her mother found the boy face down in the water. In her panic, Elodie called emergency services and told the dispatcher her mother had left the baby in the bath, a lie that became the accepted story and the source of her parents' hatred. Her brother's name was Jude.
At 16, Elodie deliberately got pregnant by a boy at a party, wanting a child who would love only her. She gave birth alone on the bathroom floor where her brother drowned, named the baby Jude, and raised him in a converted garage beneath her parents' house while her parents refused to acknowledge him. To manage childcare while teaching ballet, she crushed her parents' sleeping pills into Jude's milk, sedating him during her shifts.
In the present timeline, the situation deteriorates on multiple fronts. Elodie begins experiencing disturbing phenomena in the house: walls that feel warm and wet to the touch, a red substance seeping behind the wallpaper, a door that slams on her fingers with impossible force, and a floor that closes around her foot like teeth. Her health worsens with hair loss, rashes, and persistent headaches. Meanwhile, Bren asserts increasing control over Jude, disciplining him with time-outs, successfully feeding him foods Elodie never could, and winning his trust through playful affection. Jude begins preferring Bren, clinging to him at family gatherings while refusing to look at Elodie. Her jealousy is consuming.
When Jude's school calls a meeting about his developmental delays and suspicious bruises, Bren threatens the teacher with a defamation lawsuit. Elodie proposes re-enrolling Jude in preschool as a four-year-old, and during a week off from school, she systematically retrains him to believe he is four using games and rewards. Bren tightens his grip further: He arranges for Ava to pick Jude up from school, secretly takes him to a doctor who confirms the boy is severely malnourished, and one night drugs Elodie with sleeping pills so he can re-wallpaper the house, covering the rot she exposed. When she confronts him, he pins her to a wall, announces he is filing adoption paperwork for Jude, and implies she planted glass in Jude's food to harm him. He begins locking her inside the house when he leaves for work, confiscating her phone, keys, and wallet.
A flashback reveals that four months earlier, Bren and Elodie returned from a trip to find her parents had locked Jude in the garage alone for two days. While Bren waited downstairs with the boy, Elodie poured rat poison into a pot of soup her parents had made for themselves. Their deaths were later reported as a possible murder-suicide.
Trapped and desperate, Elodie tears open the house with power tools. Behind a sealed pantry door, she discovers a basement Bren told her did not exist. Inside, she finds photographs of herself spanning six years, taken from varying distances, documenting her life since she was 16 and pregnant. Dates penciled on the backs confirm Bren has been surveilling her since he was 17, when he lived in Australia with relatives. She also finds dozens of used lead-toxin testing kits, all reading positive. Bren knew the house was poisoned with lead paint and concealed it.
Bren arrives and descends to the basement. He admits to the stalking but insists he courted her properly, claiming she "started it" at a party years earlier. When he reaches for the circular saw in her hands, the blade activates. The narrative frames the moment through Elodie's insistence that the saw's faulty switch turned on by itself. The blade slashes up Bren's chest and across his face, destroying his left eye.
Elodie flees upstairs with Jude and bathes him in candlelight, realizing that the welts on his skin came not from being struck but from contact with mold and lead toxins on the nursery floor. When she tries to escape, Bren is waiting, mutilated but alive. He slams her head against the bedside table and demands the truth. She screams that she killed her brother, confessing for the first time that she let him drown and blamed her mother. Bren reveals he obtained a paternity test confirming he is Jude's biological father, the anonymous boy from the party. He proposes a game: Whoever finds Jude first keeps him.
Jude has crawled into a hole in the wall. Both parents tear at the house in panic until Bren pulls the boy from the cavity. Elodie begs Jude to come to her. He approaches, holds out his stuffed rabbit, and says, "Rabbit loves you," the closest he has ever come to telling her he loves her. Then he turns and runs back to Bren.
Bren tells Elodie to leave and never return. As he walks toward the front door with Jude, Elodie swings a claw hammer into his head, killing him. She dismembers his body with a handsaw and places the pieces inside the walls, reasoning he would want to become part of the house he loved. Jude sits in the corner with his hands over his eyes throughout.
At dawn, Elodie drives to Ava's house and hands Jude over, asking Ava to raise him. This decision represents Elodie's recognition that she is the worst thing for her son. As she drives away, his screams for her fade behind the car.
In the epilogue, months later, Elodie gives birth alone in a bathroom and names the baby Jude, repeating the cycle. She has assumed a new identity, calling herself Rose, and found work in a small Italian grocery store. Bren's ghost visits her bed each night, tender rather than vengeful. She begins drawing the attention of the store owner's grandson, a fragile young man with scars on his wrists, and the narrative suggests she is positioning herself to repeat her pattern with another vulnerable person. When the grandson asks the baby's name, she answers, "Jude. His name is Jude."