While vacationing in St. Moritz, a British couple receive a clue to an imminent assassination attempt, only to learn that their daughter has been kidnapped to keep them quiet.
Johann Strauss Jr. is forced by his father to forget music and to work in a bakery, where he falls in love with Resi, the baker's daughter. The girl gets jealous when a contessa asks Strauss Jr. to write a waltz for her.
Anton is an exiled Russian Grand-duke but works in a hotel as a night manager with tragic consequences.
