A psychiatrist plots to murder his wife so he can be with his mistress, but his wife mysteriously disappears before he can carry out his plan.
| Actor | Role |
|---|---|
 Christopher LeeDr. Stephen Hayward | Dr. Stephen Hayward |
 Jon FinchLomax | Lomax |
 Judy GeesonHelen | Helen |
 Dilys HamlettJulia Hayward | Julia Hayward |
 Tony BeckleySgt. Greene | Sgt. Greene |
 Jane MerrowMary Dawson | Mary Dawson |
 Colin JeavonsBob Dawson | Bob Dawson |
| DDavid TrevenaJohnson | Johnson |
| AAdrian CairnsMorgan | Morgan |
| DDaphne NevilleNurse Fisher | Nurse Fisher |
| HHugh Smith-MarriottDr. Chapman | Dr. Chapman |
| HHubert TuckerRonalds | Ronalds |
| DDavid LangfordGray | Gray |