C. R. MacNamara (Cagney), a top-ranking executive stationed in West Berlin, is charged with the care of his boss' visiting daughter. But when he learns that she's gone and married a fierce young communist - and that his boss will be arriving in town in 24 hours - Mac must transform the unwilling beatnik into a suitable son-in-law or risk losing his chance for advancement! Before you can say "one, two, three," his plans have spun out of control and into an international incident that could infuriate the Russians, the Germans and worst of all, his own suspicious wife!