 Captain Henri Rochard of the French army, and Lieutenant Catherine Gates, of the American, are assigned a mission together to stop a German high-level scientist in postwar Germany. They start out thinking they hate each other, but end up falling in love. They encounter various bureaucratic hassles trying to get married. When Catherine s army unit gets recalled back to the USA, the only way they have to stay together is by invoking a law allowing the spouse of American army personnel to enter the country -- the War Bride s act.