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.
Unfortunately the movie Diagnosis: Murder is not yet available on HBO Max.
| Directing | Sidney Hayers | Director |
| Art | Kenneth Jones | Art Direction |
| Writing | Ivan Goff | Writer |
| Writing | Ben Roberts | Writer |
| Writing | Philip Levene | Screenstory |
| Production | Patrick Dromgoole | Executive Producer |
| Production | Peter Miller | Producer |
| Production | Michael Towers | Associate Producer |
| Sound | Laurie Johnson | Original Music Composer |
| Camera | Bob Edwards | Director of Photography |
| Editing | David Williams | Editor |
| Editing | John W. Carr | Assistant Editor |
| Editing | Barry Peters | Supervising Editor |
| Art | Ken Bridgeman | Set Decoration |
| Costume & Make-Up | Christine Penwarden | Makeup Artist |
| Production | F. Sherwin Green | Production Supervisor |
| Sound | Mike Davey | Sound Recordist |