A London solicitor and a French detective investigate the mysterious death of an elderly woman suspected of being poisoned.
| Directing | Michael Anderson | Director |
| Writing | A.E.W. Mason | Novel |
| Writing | Edward Dryhurst | Writer |
| Production | Vaughan N. Dean | Producer |
| Sound | Gerald Crossman | Music |
| Camera | Erwin Hillier | Director of Photography |
| Editing | Edward B. Jarvis | Editor |
| Production | Robert Lennard | Casting |
| Art | Terence Verity | Production Design |
| Directing | Thelma Orr | Script Supervisor |
| Costume & Make-Up | Polly Young | Hairstylist |
| Costume & Make-Up | Eric Aylott | Makeup Artist |
| Sound | Les Hammond | Sound Recordist |
