At the start of WWII, Katie O'Hara, an American burlesque girl intent on social climbing, marries Austrian Baron Von Luber. Pat O'Toole, an American radio reporter, sees this as a chance to investigate Von Luber, who is suspected of having Nazi ties. As country after country falls to the Nazis, O'Toole follows O'Hara across Europe. At first he is after a story, but he gradually falls in love with her. When she learns that her husband is indeed a Nazi, O'Hara fakes her death and runs off with O'Toole. In Paris, she is recruited to spy for the allies; he uses a radio broadcast to make Von Luber and the Nazis look like fools.