"Teenagers gathered in an old mansion are being murdered one by one. The survivors must discover who among them is the killer before he finishes off everybody."
Frankie Avalon
as Chris
Jill Haworth
as Sheila
Dennis Price
as Inspector Bill Bradley
Mark Wynter
as Gary Scott
George Sewell
as Bob Kellett
Gina Warwick
as Sylvia Fuller
Richard O'Sullivan
as Peter
Carol Dilworth
as Dorothy Pulman
Julian Barnes
as Richard
Veronica Doran
as Madge
Robin Stewart
as Henry
Jan Holden
as Peggy
Clifford Earl
as Sgt Pelley
Robert Raglan
as John Bradley
Vicki Michelle
as Sally (uncredited)
Nicholas Young
as Party Guest (uncredited)
Bill Hibbert
as Man in Pub (uncredited)
Michael Armstrong
Director
Screenplay
Reg Tilsley
Original Music Composer
Conductor
Peter Pitt
Editor
Alan Kane
Sound Mixer
Cliff Sharpe
Makeup Artist
Michael McKeag
Assistant Director
Nick Caris Carter
Alan Boast
Camera Operator
Carol Beckett
Hairdresser
Tony Tenser
Producer
George Mills
Production Manager
Jack Atcheler
Director of Photography
James Devis
Hilda Geerdts
Wardrobe Assistant
Ross Carver
Kathleen Moore
Hayden Pearce
Art Direction
Lorna Selwyn
Continuity
Arthur Evans
Still Photographer