Patricia is driving to visit her mother in another city after a difficult breakup, hoping the trip will help. The route takes her through an abandoned town called Town of Sin, which has a history she was not aware of: a satanic cult used to conduct human sacrifices there on Halloween each year, until the demon they had summoned was not satisfied and killed all of them in ways that were not merciful. Patricia enters the town unaware of any of this. Her fuel gauge drops without explanation. She stops in front of a house decorated with jack-o-lanterns. The rest of the Halloween night follows.