"A mute young woman is stalked by a serial killer at her uncle's mansion."
Jacqueline Bisset
as Helen
Christopher Plummer
as Dr. Sherman
John Phillip Law
as Steven
Sam Wanamaker
as Lieut. Fields
Mildred Dunnock
as Mrs. Sherman
Gayle Hunnicutt
as Blanche
Elaine Stritch
as Nurse
John Ronane
as Dr. Rawley
Sheila Brennan
as Mrs. Oates
Ronald Radd
as Oates
Heather Lowe
as Blind Girl
Christopher Malcolm
as Policeman
Harry Van Engel
as Police Photographer
Tina Simmons
as Visitor (uncredited)
Peter Collinson
Director
Ken Hodges
Director of Photography
David Lindup
Original Music Composer
Pat McDermott
Hairstylist
Chris Carreras
Third Assistant Director
Masada Wilmot
Wardrobe Supervisor
Roy Ford
Camera Operator
Keith Blake
Focus Puller
John Smallcombe
Assistant Director Trainee
Angela Allen
Continuity
Brian Elvin
Philip Martell
Music Director
Tony Tweedale
Unit Publicist
Jim Willis
Sound Mixer
Patrick Heigham
Other
David Munro
Location Manager
Tom Sachs
Associate Producer
Clive Reed
Assistant Director
Raymond Poulton
Editor
Allan Scott
Screenplay
Mel Dinelli
Original Film Writer
Paul Engelen
Makeup Artist
Josef Shaftel
Executive Producer
Eric Allwright
Peter Shaw
Producer
Disley Jones
Art Direction
Chris Bryant
Ethel Lina White
Novel
Rose Tobias Shaw
Casting
Bert Batt
Derek Holding
Sound Editor
Trevor Pyke
Sound Recordist
