London: A group of students at an all night party dare each other to play a ouija board. But what starts out as fun rapidly turns into a nightmare, when the glass spells out the message: ALL DIE.

Unnerved, the students retreat to their house, but as one by one they fall prey to a succession of disturbing murders, the remaining friends know they must somehow banish the evil they have awakened, before it claims its next victim. With time running out, and the head count growing, they realise they can't trust anybody, not even each other.