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In this espionage film, set just before the Germans invaded France, a chemist in Paris moonlights as a Soviet spy. To escape the Nazi invaders, the chemist and his wife steal government money and try to escape to South America. En route, their ship stops in Trinidad where they two cannot pass unless they fork over all of the money. Suddenly 24 years have passed and the man who obstructed them is still working as a British agent. He is investigating a formula that has leaked through to the enemy. This brings him in contact with the chemist again. This time, the agent helps the chemist escape the Soviet agents who pursue him.