Con man Dudley Jerico sets out to rob corrupt millionaire Victor Rosso of his legendary Gemini diamond, but there's another operator in town who is out to con the con.
| Directing | Sidney Hayers | Director |
| Writing | David T. Chantler | Story |
| Writing | Philip Levene | Writer |
| Production | Barry Delmaine | Associate Producer |
| Production | Philip Levene | Associate Producer |
| Production | Julian Wintle | Producer |
| Sound | Laurie Johnson | Original Music Composer |
| Camera | Alan Hume | Director of Photography |
| Editing | Lionel Selwyn | Editor |
| Art | Harry Pottle | Production Design |
| Art | Harry Pottle | Art Direction |
| Costume & Make-Up | Bill Griffiths | Hairdresser |
| Costume & Make-Up | Bunty Phillips | Makeup Artist |
| Production | Ray Frift | Production Manager |
| Directing | Ivor Powell | Assistant Director |
| Art | William Green | Construction Manager |
| Sound | A. W. Lumkin | Recording Supervision |
| Sound | Denis Porter | Sound Recordist |
| Sound | Dennis Whitlock | Sound Mixer |
| Sound | Alan Willis | Sound Editor |
| Sound | A. W. Lumkin | Sound Supervisor |
| Crew | Ivan Pulis | Stunt Double |
| Crew | Roy Vincente | Stunts |
| Camera | Tony White | Camera Operator |
| Costume & Make-Up | Laura Nightingale | Wardrobe Master |
| Sound | Laurie Johnson | Conductor |
| Directing | Marjorie Lavelly | Continuity |
