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 | Neil McCallum | Screenplay |
| Writing | Evelyn Berckman | Novel |
| Production | Barbara Allen | Production Secretary |
| Sound | Spencer Reeve | Sound Editor |
| Art | Peter Russell | Assistant Art Director |
| Directing | Renée Glynne | Continuity |
| Art | Tony Reading | Draughtsman |
| Costume & Make-Up | Jean Fairlie | Wardrobe Supervisor |
| Camera | Louis H. Lavelly | Focus Puller |
| Sound | Buster Ambler | Sound Recordist |
| Art | George Provis | Art Direction |
| Camera | Len Harris | Camera Operator |
| Costume & Make-Up | Joyce James | Hairdresser |
| Sound | Colin Miller | Assistant Sound Editor |
| Directing | Gordon Gilbert | Assistant Director |
| Production | Jack Parsons | Producer |
| Camera | Laurie Ridley | Still Photographer |
| Sound | Tom Buchanan | Boom Operator |
| Costume & Make-Up | Harold Fletcher | Makeup Artist |
| Sound | Philip Martell | Conductor |
| Directing | Ray Freeborn | Third Assistant Director |
| Camera | Arthur Lavis | Director of Photography |
| Directing | Michael Dryhurst | Second Assistant Director |
| Sound | Carlo Martelli | Original Music Composer |
| Production | Clifton Brandon | Production Manager |
| Editing | Robert Winter | Editor |
| Sound | Barbara Hopkins | Sound |
