Behind it's forbidden doors an evil secret hides!

Teenagers gathered in an old mansion are being murdered one by one. The survivors must discover who among them is the killer before he finishes off everybody.

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Main Cast: Frankie Avalon, Jill Haworth, Dennis Price, Mark Wynter, George Sewell, Gina Warwick, Richard O'Sullivan, Carol Dilworth, Julian Barnes, Veronica Doran

Director: Michael Armstrong

Writer: Michael Armstrong

Editor: Peter Pitt

Cinematographer: Jack Atcheler

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