Ashley, a 17-year-old babysitter, arrives to take care of 12-year-old Luke during the holiday season. Luke's parents go out for the night, leaving the two alone in the large suburban house. Luke, who has a crush on Ashley, attempts to impress her with his maturity, but his efforts seem childish to her. As they settle in, strange and unsettling occurrences begin to unfold. The unexpected sounds, unusual movements, and seemingly random events escalate quickly, leading them to suspect they might not be alone.

Attempting to ensure their safety, Ashley initiates a series of measures to protect them from potential intruders. However, as the night progresses, the situation takes several dark and unexpected turns, revealing hidden intentions and startling truths. The tension in the house rises, as what initially seemed like harmless pranks or minor disturbances becomes increasingly dangerous and intricate. Amidst the chaos, surprising alliances are formed and broken, leading to a suspenseful and unpredictable confrontation that brings out disturbing facets of each character involved.