"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
Pat McDermott
Hairstylist
Ken Hodges
Director of Photography
David Lindup
Original Music Composer
John Smallcombe
Assistant Director Trainee
Roy Ford
Camera Operator
David Munro
Location Manager
Philip Martell
Music Director
Masada Wilmot
Wardrobe Supervisor
Patrick Heigham
Other
Brian Elvin
Keith Blake
Focus Puller
Tony Tweedale
Unit Publicist
Jim Willis
Sound Mixer
Angela Allen
Continuity
Chris Carreras
Third Assistant Director
Paul Engelen
Makeup Artist
Chris Bryant
Screenplay
Rose Tobias Shaw
Casting
Disley Jones
Art Direction
Allan Scott
Clive Reed
Assistant Director
Josef Shaftel
Executive Producer
Raymond Poulton
Editor
Ethel Lina White
Novel
Eric Allwright
Tom Sachs
Associate Producer
Peter Shaw
Producer
Mel Dinelli
Original Film Writer
Bert Batt
Derek Holding
Sound Editor
Trevor Pyke
Sound Recordist
