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Trying to salvage an evening after a dull party, a group of English mods and their American friend, Chris (Frankie Avalon), decide to pay a visit to a supposedly haunted mansion. They lock themselves in, and, following a seance, one of them is brutally killed. Realizing the killer must be one of their own, unofficial ringleader Chris prevails on everyone to bury the body and keep quiet. It's only after the police begin investigating that the group decides to ferret out the killer. Wikipedia