Antonio Riccardi, a rare stamp dealer who is secretly a hired killer, pays for the violin lessons of his gifted brother Giuseppe. To meet the expenses of Giuseppe's concert debut he accepts a further job, but his decision to do so provides Detective Inspector Carson, who has long hoped to ensnare Tony, with an opportunity that might now enable him to bring about his downfall.
| Art | George Haslam | Art Direction |
| Writing | Rex Rienits | Writer |
| Production | Julian Wintle | Producer |
| Editing | Eric Hodges | Editor |
| Directing | Michael McCarthy | Director |
| Camera | Moray Grant | Camera Operator |
| Costume & Make-Up | Jack Craig | Makeup Artist |
| Sound | Ronnie Emanuel | Original Music Composer |
| Sound | Dick Smith | Sound Recordist |
| Camera | Robert LaPresle | Director of Photography |
| Production | George Mills | Production Manager |
| Production | William H. Williams | Production Supervisor |
| Directing | Ted Holliday | Assistant Director |
| Directing | Betty Harley | Continuity |
| Costume & Make-Up | Jayne Seymour | Hairstylist |
| Costume & Make-Up | M.E. Gillett | Wardrobe Master |
| Sound | Laurie Clarkson | Sound Recordist |
