During a visit to childhood friend Edith, retired housewife Hetty Wainthropp discovers that Edith's husband, Frank, has a son by a previous marriage. Hetty decides to turn amateur detective to trace him. When this gives her a taste for detection, Hetty decides to set up a private detective agency.
Unfortunately the movie Missing Persons is not yet available on HBO Max.
| Writing | David Cook | Novel |
| Production | Derek Bennett | Producer |
| Writing | David Cook | Screenplay |
| Art | Ian Fisher | Production Design |
| Camera | Peter Jackson | Director of Photography |
| Sound | Lee Corbett | Sound Recordist |
| Costume & Make-Up | John Fraser | Costumer |
| Costume & Make-Up | Pam Fox | Makeup Artist |
| Art | Trevor Hodgson | Graphic Designer |
| Sound | David Snell | Music |
| Editing | David Aspinall | Editor |
| Lighting | Andrew Potts | Electrician |
| Production | Paddy Stern | Casting |
| Production | Keith Richardson | Executive Producer |
| Art | Dave Proctor | Props |
| Directing | Patricia Robertshaw | Continuity |
| Production | David Nightingale | Unit Manager |
| Production | Liz Westbrook | Unit Manager |
| Production | Pat Brown | Production Assistant |
| Directing | Derek Bennett | Director |
