Appalled at the carnage being wreaked on allied ships by Nazi war vessels, the movie actress Hedy Lamarr invents a device that will prevent German ships and U-boats from jamming the allied warships' radio-guided torpedoes. Secret Nazi supporter, Errol Flynn, discovers the details about Hedy's invention and, with the help of Austrian doctor and Nazi spy, Hermann Erben, sabotages her efforts to have her apparatus adopted by the U.S. Navy. Angered...