"A physician discovers that two children are being kept virtually imprisoned in their house by their father. He investigates, and discovers a web of sex, incest and satanic possession."
Robert Hardy
as Zorn
Shane Briant
as Emil
Gillian Hills
as Elizabeth
Yvonne Mitchell
as Hilda
Paul Jones
as Carl Richter
Patrick Magee
as Falkenberg
Kenneth J. Warren
as Klaus
Michael Hordern
as Priest
Robert Brown
as Fischinger
Virginia Wetherell
as Inge
Deirdre Costello
as Magda
Barry Stanton
as Ernst
Sidonie Bond
as Zorn's Wife
Thomas Heathcote
as Coachman
John Atkinson
as 1st Villager
George Cormack
as 2nd Villager
Mary Hignett
as Matronly Woman
Sheila Raynor
as Old Crone
Jan Adair
as 1st Girl
Jane Cardew
as 2nd Girl
Glenda Allen
as Girl (uncredited)
Richard Beaumont
as Young Emil (uncredited)
Fred Wood
as Villager Carrying Torch (uncredited)
Christopher Wicking
Writer
Harry Robertson
Original Music Composer
Peter Sykes
Director
Michael Stringer
Production Design
Arthur Grant
Director of Photography
Michael Carreras
Producer
Chris Barnes
Editor
Frank Godwin
Trevor Crole-Rees
Makeup Artist
Christopher Neame
Production Manager
Original Story
James Liggat
Casting
Roy Skeggs
Production Supervisor
Philip Martell
Music Supervisor
Ted Morley
Assistant Director
Gladys Goldsmith
Continuity
Neil Binney
Camera Operator
John Purchese
Sound Recordist
Len Abbott
Sound Mixer
Terry Poulton
Sound Editor
A.W. Lumkin
Sound Director
Bill Brodie
Assistant Art Director
Bill Greene
Construction Manager
Rosemary Burrows
Wardrobe Supervisor
Eileen Sullivan
Wardrobe Master
Maude Onslow
Hairdresser