Claire Cooper, Annette Bening, is a suburban housewife and mother who spends her spare moments illustrating children’s stories. Her husband, Paul Cooper — an airline pilot who is frequently away for work and perhaps entangled in an affair with a fellow Australian coworker — leaves Claire to raise their eight-year-old daughter, Rebecca Cooper. The quiet rhythm of their days is punctured when Claire begins to experience strange, hazy dreams about an underwater city and the murder of a young girl. These visions feel almost like memories rather than fantasies, a sense that something terrible from her past is waking up.
Shortly after these dreams begin, Rebecca goes missing during an outdoor school play and is later found dead at the bottom of a reservoir. The shock shatters Claire’s sense of reality, and she clings to the belief that the dreams may be premonitions or traces of a long-buried truth. As she grows more convinced that she is witnessing the movements of a killer, she identifies the man behind the crimes as Vivian Thompson, a figure she has seen in her visions for years. The underwater city she keeps dreaming about, she discovers, is not imaginary at all, but the remains of a former town called Northfield that was flooded when the reservoir was created.
Driven by a mix of desperation and maternal resolve, Claire tries to insert herself into the police investigation, only to meet increasing resistance from investigators who doubt her perceptions. The more she envisions Vivian moving through the lives of other girls, the more unhinged she feels, yet the more clear and vivid the connections become. She learns that Vivian is not merely a vengeful dream—he is a disturbingly real killer, a childlike man who kidnaps girls to turn them into his own perverse “playmates.” The doctor she seeks help from, Dr. Silverman, a psychologist who assesses her condition, confirms that her experiences point toward possible psychosis, a diagnosis that lands her in a psychiatric institution after she slashes her wrists in a moment of overwhelmed despair. Even behind the sterile walls, the visions persist: she sees Vivian murdering Paul, a catastrophe she cannot avert, a looming threat that refuses to stay buried.
When a renewed surge of visions culminates in a chance to rescue another girl, Claire escapes the hospital and steals a guard’s vehicle, determined to pursue Vivian to a remote location along the lake. Her search leads her to an abandoned fruit factory where the water laps at the margins of the building, a setting that feels almost like a sealed memory waiting to be unlocked. Inside, she comes face to face with Vivian and the young girl, Ruby, Krystal Benn, whom Vivian has abducted to form his warped “family.” Vivian’s fearsome charm masks a deep-seated cruelty, and he attempts to keep Claire and Ruby with him as his new companions, a perverse idea of kinship born of abuse.
The police close in, tracking Claire to the factory as a tense confrontation unfolds. A SWAT helicopter hovers above, attempting to snipe Vivian from the air, while Vivian pursues Claire along a narrow bridge that spans a treacherous tributary and a rushing waterfall. In a brutal struggle, both Claire and Vivian are knocked over the guardrail and fall into the churning water. Claire’s last moment of lucidity is a vision of being reunited with her daughter as they slip beneath the surface, and she drowns in the cold depths. Vivian survives the fall, but the violence of the confrontation takes its toll on him in a different way.
In the aftermath, Vivian is committed to the same psychiatric institute where Claire once endured confinement. Lying in his bed, he is haunted by visions of Claire’s spirit and by a chilling descent into despair as the words “Sweet dreams, Vivian” appear in blood on the ceiling, then spread across the walls of his cell. The haunting image seals his fate with a scream that echoes through the silent ward, a grim reminder that the line between nightmare and memory can blur beyond recognition.
