While in London trying to nab several fugitives who stole a million dollars from a U.S. Treasury vault, American federal agent Dennison (Dennis O'Keefe) assists Scotland Yard Insp. McClaren (Philip Friend) in his search for a missing atomic scientist (Paul Hardtmuth). The detective duo discovers that the key to solving both cases may rest with the scientist's daughter (Margaret Sheridan) and her fascinating diamond.
A young woman leaves her backwards hometown to go to London to find a runaway suitor. What she doesn't know is that she has inherited a strange ability; if she's in the vicinity of a machine for more than fifteen minutes, it stops working.
When a nightclub singer is arrested for murder, his pregnant girlfriend moves into a boarding house for women, but the mother-to-be soon discovers that her new lodgings harbors a horrific secret.
