Psychosis

A group of young anarchists is brutally murdered in 1992 as they try to preserve local wildlife. The killer is wounded while attempting to kill a lone survivor and is later found collapsed by the river. This grim incident establishes the film's dark backstory and the killer's haunting presence.

The killer from the 1992 killings is captured and placed in custody after the massacre. The backstory lingers as a chilling reminder of the past. Authorities' notes hint at the killer's looming influence on future events.

In 2007, Susan, a successful crime novelist, moves into the house with her husband David so she can write. The couple settles in, seeking a fresh start, while Susan's sense of unease begins to grow. The house itself becomes a character in her creative imagination.

Susan notices Peck, the gamekeeper, displaying unsettling behavior, including sex in the woods near the property. The ghostly atmosphere around the house intensifies as she becomes wary of him. These early incidents foreshadow the danger lurking within the estate.

Susan experiences disturbing visions centered on bloody bodies—the killer from the opening scene and others who appear and vanish. The line between reality and imagination blurs as the images intrude on her daily life. These visions set the stage for the house's deadly secrets.

David leaves on a supposed business trip, which is later revealed as a cover for his affairs. While he's away, Peck drugs and rapes Susan, turning her dread into a terrifying personal trauma. The assault compounds her fear that the house is a malevolent force.

Susan confides in a local priest, who arranges for a psychic to examine the house. The psychic declares that supernatural entities inhabit the property, reinforcing Susan's belief in a haunted place. The church's involvement adds a veneer of legitimacy to the eerie happenings.

Following the examination, Susan witnesses a brutal murder sequence echoing her visions. The violence culminates when she accidentally kills Peck while he checks on her. The night shatters what remains of her sanity.

Traumatized, Susan is committed to a mental institution, where the boundaries between dream and reality become increasingly tangled. Her earlier breakdown is recast as a pathological condition rather than premonitions. The institution marks a turning point away from her former life as a writer.

It is revealed that Susan has been channeling her visions into her latest book, which instantly becomes a bestseller. David is shown receiving money for the book, and it is implied he only married her for her wealth. Peck's actions are hinted to have been driven by a plan to obtain divorce-related blackmail.

David returns to the house to finalize the sale to a new owner, unaware of the danger awaiting him. The figures Susan had seen in her visions materialize, signaling that the premonitions were real. The killer—the very figure Susan had been seeing all along—murders David, revealing that her visions were not insanity but premonitions of future murders, and that the killer had survived, been incarcerated, and escaped.