When 17-year-old Colton is tasked with looking after his younger sister during the summer, he becomes infatuated with Heather, the stunning new girl who has moved into the enigmatic old house opposite his. As he admires her from a distance, he also observes her foster father’s behavior becoming more menacing. Colton begins to suspect that the man is part of a Satanic cult and is planning to sacrifice her in a ritual. Driven by desperation, Colton takes action to save her, only to discover that the reality of the situation is far more terrifying than he could have ever anticipated.