When a ransom bid results in the death of a child, the police have only one lead – the old lady who witnessed the kidnapper using a public phone box. Though her recollection is vague, she volunteers to act as bait for the killer – telling the press that she had seen the kidnapper's face and she waits for him to attack.
Is Do You Know This Voice? on Netflix? Yes! The movie Do You Know This Voice? is now on Netflix in the countries listed below.
| Directing | Frank Nesbitt | Director |
| Writing | Evelyn Berckman | Novel |
| Writing | Neil McCallum | Screenplay |
| Production | Barbara Allen | Production Secretary |
| Directing | Renée Glynne | Continuity |
| Sound | Philip Martell | Conductor |
| Costume & Make-Up | Jean Fairlie | Wardrobe Supervisor |
| Camera | Laurie Ridley | Still Photographer |
| Camera | Louis H. Lavelly | Focus Puller |
| Camera | Len Harris | Camera Operator |
| Sound | Colin Miller | Assistant Sound Editor |
| Sound | Tom Buchanan | Boom Operator |
| Sound | Spencer Reeve | Sound Editor |
| Sound | Buster Ambler | Sound Recordist |
| Art | Peter Russell | Assistant Art Director |
| Art | Tony Reading | Draughtsman |
| Directing | Ray Freeborn | Third Assistant Director |
| Directing | Michael Dryhurst | Second Assistant Director |
| Directing | Gordon Gilbert | Assistant Director |
| Production | Clifton Brandon | Production Manager |
| Costume & Make-Up | Joyce James | Hairdresser |
| Costume & Make-Up | Harold Fletcher | Makeup Artist |
| Art | George Provis | Art Direction |
| Editing | Robert Winter | Editor |
| Camera | Arthur Lavis | Director of Photography |
| Sound | Carlo Martelli | Original Music Composer |
| Production | Jack Parsons | Producer |
| Sound | Barbara Hopkins | Sound |
