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.
Tom Conway
Michael Balfour
Honor Blackman
Brian Worth
Bruce Seton
Freddie Mills
Alexander Gauge
John Horsley
Paddy Webster
John Colicos
Larry Taylor
Arthur Lowe
Frederick Schrecker
Marianne Walla
Russell Westwood