Americans Ross and Elliott, arrive in England and end up staying at a country mansion when their car is forced off the road. After the other guests at the house (Gray, Neil, Daltrey, Montague, and Broome) begin dying in strange ways, the new couple eventually discovers that the victims
were members of a Satanic cult and had sold their souls to the Devil. Bedridden millionaire Standing is the leader of the cult and the man who is collecting the debts. It seems, moreover, that Ross is the reincarnation of Standing's mother and predestined to take over the sect upon his death.
Elliott, naturally, is a bit upset by the news and takes steps to end this nonsense. This wa...