The mental breakdown of a guilt-ridden man provides the drama in this fascinating psychological profile starring Richard Attenborough as a scientist who can't live with himself after he accidently kills the brother of his fiancee.
| Writing | Alun Falconer | Writer |
| Crew | Don Chaffey | Additional Dialogue |
| Directing | Don Chaffey | Director |
| Editing | John Trumper | Editor |
| Crew | Robert Dunbar | Additional Dialogue |
| Production | Robert Dunbar | Producer |
| Camera | Gerald Gibbs | Director of Photography |
| Art | William Kellner | Art Direction |
| Costume & Make-Up | Philip Leakey | Makeup Artist |
| Production | Ralph Bond | Executive In Charge Of Production |
| Production | 'Freddie' Pearson | Production Manager |
| Directing | Ronald Spencer | Assistant Director |
| Sound | Bill Salter | Sound Recordist |
| Camera | Gerry Massy-Collier | Camera Operator |
| Costume & Make-Up | Betty Adamson | Wardrobe Master |
| Directing | Jane Buck | Continuity |
| Costume & Make-Up | Betty Sherriff | Hairstylist |