Berlin, after the Second World War: C.R. MacNamara presides over the German branch of Coca-Cola, dreaming of being promoted to London, by capturing the untapped Russian market. His plans for advancement run into a snag, when he is asked to watch over the boss' ditsy, impulsive 17 year-old daughter Scarlett on her European vacation. Unsurprisingly, she almost immediately gets into trouble of the worst kind by slipping across the border to East Germany, to marry the violently anti-Yankee Communist Otto. When the home office headman decides to visit his daughter, Cagney masterminds an elaborate masquerade that backfires.