n this Hammer Horror take of 'Diabolique', Penny is the mentally unbalanced wife of Harry Wells a crooked businessman who kills an intruder whom was a business rival of Harry's. After helping her husband hide the body to avoid a police investigation, Penny starts having visions of the dead man appearing before her which drives her more insane. Harry think's Penny's just imagining things, while a local psychic, named Margaret, suggests an exorcism to drive the ghost away. But the real surprise is yet to come.

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