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"There's always another twist to..."
A mute young woman is stalked by a serial killer at her uncle's mansion.
Jacqueline Bisset
Helen
Christopher Plummer
Dr. Sherman
John Phillip Law
Steven
Sam Wanamaker
Lieut. Fields
Mildred Dunnock
Mrs. Sherman
Gayle Hunnicutt
Blanche
Elaine Stritch
Nurse
John Ronane
Dr. Rawley
Sheila Brennan
Mrs. Oates
Ronald Radd
Oates
