Dutch patriots, a U.S. officer and a British spy fool the Nazis with a fake Soho film company.

When Johnny Matlock whisks away a cold war secret from under the noses of Berlin's top secret agents, his every move is followed when he returns to England. His girlfriend Paula is kidnapped but her handbag is discovered at the scene of the crime by the aristocratic private eye, Duke Martin. Inside it he discovers the secret formula that the agents are searching for and tracks down her sister Paula. As Johnny grows frantic for the safe return of his girlfriend, Duke Martin plays a deadly game of double bluff with the enemy agents.

The film is based on the true story of Special Operations Executive French-born agent Odette Sansom, who was captured by the Germans in 1943, condemned to death and sent to Ravensbrück concentration camp to be executed. However, against all odds she survived the war and testified against the prison guards at the Hamburg Ravensbrück Trials. She was awarded the George Cross in 1946; the first woman ever to receive the award, and the only woman who has been awarded it while still alive. (From Wikipedia, licensed under CC-BY-SA)

During World War II, a German woman, Inga, goes missing and is presumed dead. Her infant son is placed in an orphanage where, years later, he's adopted by a childless couple. The adoptive parents' happiness is shattered when Inga reappears and insists on custody of her son.