Ten strangers are invited as weekend guests to a remote mountain mansion. When the host doesn't show up, the guests start dying, one by one.

Hugh O'Brianas Hugh Lombard
Shirley Eatonas Ann Clyde
Fabianas Mike Raven
Leo Gennas General Mandrake
Stanley Hollowayas Det. William Henry Blore
Wilfrid Hyde-Whiteas Judge Arthur Cannon
Daliah Lavias Ilona Bergen
Dennis Priceas Dr. Edward Armstrong
Marianne Hoppeas Elsa Grohmann
Mario Adorfas Joseph Grohmann