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
