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.
| Actor | Role |
|---|---|
 Hugh O'BrianHugh Lombard | Hugh Lombard |
 Shirley EatonAnn Clyde | Ann Clyde |
 FabianMike Raven | Mike Raven |
 Leo GennGeneral Mandrake | General Mandrake |
 Stanley HollowayDet. William Henry Blore | Det. William Henry Blore |
 Wilfrid Hyde-WhiteJudge Arthur Cannon | Judge Arthur Cannon |
 Daliah LaviIlona Bergen | Ilona Bergen |
 Dennis PriceDr. Edward Armstrong | Dr. Edward Armstrong |
 Marianne HoppeElsa Grohmann | Elsa Grohmann |
 Mario AdorfJoseph Grohmann | Joseph Grohmann |
 Bill MitchellNarrator (voice) | Narrator (voice) |
 Christopher LeeMr. U.N. Owen (voice) | Mr. U.N. Owen (voice) |