A small time diamond merchant jumps at the chance to supervise the purchase and cutting of a large first class diamond. But when the diamond is stolen from him, he is blackmailed into pulling off a major heist at the Diamond Exchange, located at 11 Harrowhouse.
| Directing | Aram Avakian | Director |
| Writing | Jeffrey Bloom | Screenplay |
| Writing | Gerald A. Browne | Novel |
| Writing | Charles Grodin | Adaptation |
| Editing | Anne V. Coates | Editor |
| Production | Elliott Kastner | Producer |
| Production | Denis Holt | Associate Producer |
| Sound | Michael J. Lewis | Music |
| Art | Peter Mullins | Art Direction |
| Art | Jack Stephens | Set Decoration |
| Costume & Make-Up | Biddy Chrystal | Hairdresser |
| Costume & Make-Up | Basil Newall | Makeup Artist |
| Production | David W. Orton | Production Supervisor |
| Directing | Jack Causey | Assistant Director |
| Directing | Anthony Squire | Second Unit Director |
| Directing | Raymond Becket | Second Assistant Director |
| Directing | Mike Higgins | Second Assistant Director |
| Directing | Richard Jenkins | Second Assistant Director |
| Directing | Derek Kavanagh | First Assistant Director |
| Art | John Siddall | Art Department Manager |
| Sound | Jonathan Bates | Sound Editor |
| Sound | Danny Daniel | Sound Recordist |
| Sound | Gordon K. McCallum | Sound Recordist |
| Sound | John Hayward | Sound Mixer |
| Sound | Austin Partridge | Sound |
| Crew | Roy Whybrow | Special Effects |
| Crew | Joe Powell | Stunts |
| Camera | Freddie Cooper | Camera Operator |
| Camera | Robin McDonald | Second Assistant Camera |
| Camera | Arthur Ibbetson | Director of Photography |
| Crew | Vic Armstrong | Stunts |
