Karl, a German living in America, returns to Germany at the outbreak of World War I to fight for his country, leaving his American sweetheart, Angela, behind. A rival for Angela's affections, Jules, returns to his native France to fight. Angela goes to France to care for a dying aunt, and after being rescued when her ship is torpedoed by a German U-Boat, arrives to find her aunt dead, and the chateau a field hospital. Angela remains there, and sends secret messages to the Allies when the Germans (including Karl) occupy the town. Karl catches Angela sending messages, but when his Colonel orders her to be shot, Karl denounces the Kaiser and joins Angela to face the firing squad. A French attack led by Jules saves them, and he pardons Karl. Angela and Karl return to America.