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.
Unfortunately the movie Do You Know This Voice? is not yet available on HBO Max.
| Directing | Frank Nesbitt | Director |
| Writing | Evelyn Berckman | Novel |
| Writing | Neil McCallum | Screenplay |
| Sound | Buster Ambler | Sound Recordist |
| Production | Clifton Brandon | Production Manager |
| Editing | Robert Winter | Editor |
| Directing | Renée Glynne | Continuity |
| Camera | Len Harris | Camera Operator |
| Art | George Provis | Art Direction |
| Camera | Arthur Lavis | Director of Photography |
| Sound | Carlo Martelli | Original Music Composer |
| Camera | Louis H. Lavelly | Focus Puller |
| Sound | Philip Martell | Conductor |
| Costume & Make-Up | Jean Fairlie | Wardrobe Supervisor |
| Sound | Tom Buchanan | Boom Operator |
| Art | Tony Reading | Draughtsman |
| Sound | Spencer Reeve | Sound Editor |
| Art | Peter Russell | Assistant Art Director |
| Directing | Gordon Gilbert | Assistant Director |
| Costume & Make-Up | Joyce James | Hairdresser |
| Costume & Make-Up | Harold Fletcher | Makeup Artist |
| Camera | Laurie Ridley | Still Photographer |
| Directing | Michael Dryhurst | Second Assistant Director |
| Sound | Colin Miller | Assistant Sound Editor |
| Directing | Ray Freeborn | Third Assistant Director |
| Production | Jack Parsons | Producer |
| Sound | Barbara Hopkins | Sound |
| Production | Barbara Allen | Production Secretary |
