Because she dials the wrong number, an old lady hears information which enables the police to solve a robbery and murder.

Several murders of nuclear scientists, that baffles Scotland Yard, occur in London around the same time that Bill Locklin, a special officer from the United States State Department, arrives to oversee the transfer of Professor Leon Dushenko, a Russian scientist who has fled the USSR. An attempt on Dushenko's life is made with a monkey's paw-print found at the scene.

An enjoyable story of a 13-year-old girl, Louise, who lives alone with her widowed mother. Louise is sent off to a boarding school, but not before she discovers some secret documents kept hidden by her father. A curious look reveals that her father was a member of the secret order of Freemasons. When she finally gets to school, she tries to explain to her friends what the Freemasons are. Later, Louise's mother discovers a box of condoms in her daughter's room and wrongly presumes that the girl is sexually active.

A jeweller is killed in a gang robbery leaving the daughter as the only witness. When the police can't build a case against him she decides to go undercover to infiltrate the home of the killer's brother. Slowly she is drawn into the world of the rival gangs.

Scotland Yard investigate when a woman, apparently the estranged wife of a London painter, is murdered with a shotgun in rural Surrey at the same time as the artist's striking model with her long black hair disappears.

When heavy fog prevents any flights from leaving London Airport, a group of passengers are put on a bus driven by Percy Lamb to drive to another airport. The fog is that heavy Percy doesn't know where he is going or that he is carrying stolen gold bullion that the robbers and police are relentlessly pursuing.

When Germany invades Holland in 1940, a British intelligence officer and two Dutch diamond merchants go to Amsterdam to persuade the Dutch diamond merchants to evacuate their diamond supplies to England.