David Callan, secret agent, is called back to the service after his retirement, to handle the assasination of a german businessman, but Callan refuses to co-operate until he finds out why this man is marked for death.
| Directing | Don Sharp | Director |
| Writing | James Mitchell | Author |
| Production | Derek Horne | Producer |
| Production | Harry Benn | Associate Producer |
| Sound | Wilfred Josephs | Original Music Composer |
| Camera | Ernest Steward | Director of Photography |
| Editing | Teddy Darvas | Editor |
| Production | Lesley De Pettit | Casting |
| Art | John Clark | Art Direction |
