Milly, a journalist in search of atmosphere for her forthcoming novel, travels third class to Vienna. On the train she meets an American millionairess, travelling incognito. They become friends, Milly takes over the part of the famous Miss Limford, gives interviews to the press, moves into a hotel suite. Meanwhile Miss Limford, trying to get into real Viennese working-class life, starts a job as a salesgirl in an automobile showroom. Up turns an impoverished Russian prince and an impoverished Austrian count...