Missing Persons (1990)

Director: Derek Bennett

Cast: Patricia Routledge, Tony Melody, Jimmy Jewel, Jean Heywood

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.