A small-town reporter investigates a mysterious group holed up in a country lodge.
Bank accountant Thomas Lieven is forced to work as a triple agent for the British, the French and the Nazis.
A British man is hunted by British and German spies when he tries to sell blueprints.
A Nazi spy ring is after a chemical formula that increases the power of ordinary gasoline for U.S. Army aviation use. Two U.S. chemical companies are developing the formula, with each working on half for security purposes. The spies get half the formula and know that either of two chemists, Robert Norton or Tom Fielding, knows the rest. They capture Fielding, through a ruse by gang member Linda Pavlo, and threaten the life of his sister Nancy and his mother if he does not give them the formula. To protect his friend Fielding, who does know the formula and is engaged to Nancy, Tom pretends to know the secret and boards the Dawn Express plane with the spy leader and his gang.
An intrepid radio reporter sets out to track down and expose Nazi agents.
The obsessive scientist Dr. Miller is working on a matter-transmitter invention called the Paratron; a conspiratorial team of spies and no-goods pursue him to Alaska, trying to steal the device.
FBI agent Ed Renard investigates the pre-War espionage activities of the German-American Bund.
Lucky Jordan is a gangster living in New York City and when he's drafted into the army, he tries to escape duty by using an old con woman named Annie to convince the draft board he's needed at home. When that fails, Jordan is sent to boot camp, but he doesn't stay there long. He takes a beautiful USO worker hostage and flees back to New York. There, he learns that a rival gangster is plotting against America.