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American Marie Lohr is visiting her German uncle in Strassburg when the United States enters World War I. Major von Rohn, her German suitor, endeavors to keep her apart from her boyfriend, American aviator Robert Stedman. An American bomb wounds von Rohn and kills a German spy whose identity Marie assumes in an attempt to escape across the border. Marie is stopped by lecherous German officers, but manages to get word to Robert who tries to rescue her but must hide when von Rohn returns. When von Rohn discovers someone is hiding in the closet, Marie stabs and kills him. Robert dons the German's uniform, and after a chase, flies with Marie safely over the border.