A prominent London psychologist seems to have taken his own life, causing stunned disbelief amongst his colleagues and patients. His teenage daughter refuses to believe it was suicide as this would go against all of the principles her father stood for, therefore she is convinced it was murder. She enlists the help of a former patient to try to get to the truth. However, the truth turns out to be both surprising and disturbing.
| Writing | Robert L. Joseph | Screenplay |
| Directing | Charles Crichton | Director |
| Art | Terry Knight | Draughtsman |
| Production | Robert L. Joseph | Producer |
| Editing | Frederick Wilson | Editor |
| Art | Thomas N. Morahan | Production Design |
| Camera | Douglas Slocombe | Director of Photography |
| Sound | Richard Arnell | Original Music Composer |
| Production | Shirley Bernstein | Associate Producer |
| Camera | Chic Waterson | Camera Operator |
| Directing | Peter Bolton | Assistant Director |
| Production | Davie Davison | Unit Manager |
| Directing | Joan Davis | Continuity |
| Costume & Make-Up | John McCorry | Wardrobe Master |
| Production | Josephine Knowles | Production Secretary |
| Costume & Make-Up | Kenneth Mackay | Makeup Artist |
| Costume & Make-Up | Iris Tilley | Hairstylist |
| Sound | Wally Milner | Sound Recordist |
| Sound | Len Shilton | Sound Recordist |
| Sound | Charles Crafford | Sound Editor |
