U.S. Embassy employee Lee Cochrane and his wife, Sue, receive a shock when they discover that their 18-month-old son, Simon, has disappeared in London. He was last seen with their nanny, and the couple seemingly have no leads that might help police Detective Craig in his investigation. The media sensationalizes the incident, causing an unnecessary distraction as the couple prepares to confront the culprit face-to-face.

A lusty Gypsy gold digger marries a Regency aristocrat, then learns he has no money.

Lucy Church, the sole witness to a fatal robbery, is struck by a passing bus and her life lies in the balance as the thieves wait for a chance to finish her off.

After leaving the British Secret Service, David Somers finds work catalouging butterflies at the country house of Nicholas and Jess Fenton. After the murder of a local gamekeeper, suspicion falls on their niece, Sophie Malraux. Somers helps Sophie to escape arrest and they go on the run together.

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.

Edward "Teddy" Bare is a ruthless schemer who thinks he's hit the big time when he kills his older wife, believing he will inherit a fortune. When things don't go according to plan, Teddy sets his sights on a new victim: wealthy widow Freda Jeffries. Unfortunately for the unscrupulous criminal, Freda is much more guarded and sassy than his last wife, making separating her from her money considerably more challenging.