An American art student in England falls in love with a beautiful Englishwoman. It turns out that she's a nudist, and in spite of his misgivings, he decides to join her at her nudist camp.

Scotland Yard detectives attempt to solve a spate of safe robberies across England beginning with clues found at the latest burglary in London. The film is notable for using a police procedural style made popular by Ealing in their 1950 film The Blue Lamp. It is known in the US as The Third Key.