Sarah, along with her father John and uncle Peter, is helping to repair their family’s dilapidated lakeside house in preparation for its sale. The house, isolated and without electricity, becomes increasingly disturbing as mysterious noises and shadows hint at an unseen presence. When Peter leaves to gather supplies, Sarah experiences a series of unnerving encounters that escalate her fear and confusion. Alone in the poorly-lit house with a sense of dread growing around her, odd events begin to suggest that someone—or something—else is inside with her.

As she navigates the haunting environment, memories and suppressed secrets from Sarah's past start to surface, blending with the present horrors. Darkness falls, and the line between reality and terror blurs, forcing Sarah to question her sanity and the true nature of the house. Her father's strange behavior and cryptic hints exacerbate her mounting anxiety. Facing a labyrinth of hallways and locked doors, Sarah must gather the strength to confront the chilling truths hidden within the walls before it consumes her completely.