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One evening, a bored pack of London twentysomethings blew off a dull shindig to go check out an abandoned mansion with a history marked by madness and murder. Of course, it’s all giggles until one of them turns up knifed--and after the panicked partiers elect to cover up the crime, the days that follow find them terrorized by the unknown assailant, out to finish the job one by one. Swinging-era shocker stars Frankie Avalon, Jill Haworth, Mark Wynter, George Sewell, and Dennis Price. AKA: "Horror House," "The Dark." 88 min. Widescreen; Soundtrack: English/