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FBI agent G. B. Fleming (Roger Pryor) devises a strategy to capture the Nazis when he learns that an American scientist working on radio technology was murdered by Nazi spies. His plan involves alerting the radio men of US ship movements and further including the entire local spy ring. The FBI will tail the unemployed radio technicians, as many of them will seek work from the Nazis. We know his plan was working because radio signals were able to help combat the U-Boats.
Engineer Lewis J. “Lew” Deerhold (Richard Arlen) is a veteran who blames his firing at a radio repair shop on his Canadian citizenship. In addition, Lew is responsible for taking care of his niece Tina (Patsy Nash), a war orphan in desperate need of a brain surgery. While looking for a way to make ends meet, he comes across a radio repair shop where Ann Patterson (Wendy Barrie), a purse snatching victim, works. After Lew returns her purse to her, he asks her out on a date.
Upon arriving at his apartment, he finds his new employer waiting alongside Dr. Arthur Huneker (Nils Asther) and his aide Vincent Bela (Marc Lawrence). Huneker, a Nazi spy commander offered Lew a position. He wanted someone to fix a stolen radio transmitter. Lew gets put under surveillance by an FBI agent, Ann. She stumbles upon the blueprints of the transmitter in Lew’s belongings. While FBI agent Freddie Grayson (Ralph Sanford) is combing through Lew’s apartment, he gets shot but manages to inform Lew that the doctor is the one who possesses the radio transmitter and shot him.
Huneker, whom Lew approaches, is with Japanese Commander Toyo (Abner Biberman) during this meeting. Lew is told the two are eager to bring him on board with the Nazi party; he plays along. During the interrogation of the Bambridge shipping company owner (John Miljan), their new recruit is told to take out Bambridge, who is in fact Captain Hargas, an American agent. Rather than completing his mission, Lew gets away with the transmitter codes.
Lew and Ann team up at the doctor’s hot springs spa resort but all but Huneker manages to capture them and keeps them in a sauna room. Before steam kills them, Lew manages to create a device to signal for help that a little child whose father contacts the FBI receives. By the time FBI agents reach Lew and Ann, Hank and his men are already caught. Agent Fleming on the other hand calls in a bomb squad while heading towards Lew and Ann, that takes out the Japanese submarine hiding off the coast of California. After the operation, Lew is gifted US Citizenship and with his niece Tina and Ann present, celebrates with US army privates.
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