To stave off creditors of a young composer, his friend plants a news story that he is engaged to an American heiress.

A young medical student returns to his Tyrolean home to find out that Napoleon's troops have taken over the area and that his mother and sister have been murdered.

Baron Franz von Naydek is constantly being mistaken for Prince Woronzeff, since both look identical. One day, Woronzeff decides that this similarity might come in handy. Since he is very ill and can no longer deal with the intrigues of his relatives, he begs his friend Naydek to play the role of prince for a while. Naydek agrees and everything seems to be going splendidly. Woronzeff’s ex-nag Diane sees through the game, however, but says nothing, since she’s fallen for Naydek. He, in turn, has the hots for Nadja, Woronzeff’s daughter, long thought lost and who has now reappeared. The prince’s relatives fear for their inheritance and so refuse to acknowledge Nadja’s existence. In the interim, Woronzeff dies. Now Naydek is obliged to play the role for a much longer time than he bargained for.

A nightclub waiter and a manicurist share the same room, she sleeps there by night and he by day. They've never meet , but they can't stand each other. Then they meet by chance, not knowing who's who and fall in love.