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Behind it's forbidden doors an evil secret hides!
Teenagers in an old mansion are being murdered one by one. The survivors must discover who among them is the killer before they're all finished off.
July 15, 1969
Tigon British Film Productions, Tigon
16 people
Frankie Avalon
Chris
Acting
Jill Haworth
Sheila
Acting
Dennis Price
Inspector Bill Bradley
Acting
Mark Wynter
Gary Scott
Acting
George Sewell
Bob Kellett
Acting
Gina Warwick
Sylvia Fuller
Acting
Richard O'Sullivan
Peter
Acting
Carol Dilworth
Dorothy Pulman
Acting
Julian Barnes
Richard
Acting
Veronica Doran
Madge
Acting
Robin Stewart
Henry
Acting
Jan Holden
Peggy
Acting
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