"A house that expands on Halloween..."
Students in a catholic school meet in an abandoned home from which partygoers never returned.
They bring with them Mouse, a timid girl who is afraid of the house because her sister Angela was one of the teenagers that disappeared.
They awaken, in this house, a demon who tries to possess each of them, one after the other. The group of partygoers succeeds in escaping but they unknowingly bring back the demon.