Agatha Christie's Poirot - Season 2 Episode 7
The Adventure of the Cheap Flat

A glamorous nightclub singer turned spy has stolen the US Navys plans for a new submarine, and an FBI agent called Burt is in London to catch her. Burt dismisses Poirot as a gumshoe, and Poirot is likewise not impressed by the self-important G-man. Poirot is drawn into the case when it appears that the submarine plans will fall into the hands of the Fascist government in Italy unless they are recovered. When Poirot meets a young couple whove got an amazing bargain on a prime apartment, he sees a connection with the spy case.