Two British police officers, Robby and Jean, go undercover by pretending to be husband and wife in order to infiltrate and dismantle a ring of smugglers along the Thames. During their investigation, they visit some of London’s shadiest locales, including a notorious night club. By befriending and deceiving the club's owner, they uncover crucial evidence that leads to the top of the smuggling ring. However, their identities are exposed before they can report back, forcing them to confront the criminals alone until they manage to have them all arrested. Cast: - John Blythe as Robby - Lorna Dean as Jean - Wally Patch as The Guy - Stan Paskin - Cyril Collins - George Crowther - Andrew Sterne - Wilton West - Tony Merrett - George Kane - Johnny Doherty - Iris Keen - Dolly Gwynne Runtime: 46 minutes