Prince Klemens von Metternich orders Friedrich Gentz, one of his aides, to keep the Duke of Reichstadt---Napoleon Francois Joseph Charles---son of Napoleon and heir to the French throne, from thinking about French politics. Gentz enlists the help of ballerina Fanny Elsser, all the rage in several European capitals, to keep the Duke distracted.
Lilian Harvey
as Fanny Elßler
Willy Birgel
as Hofrat Friedrich Gentz
Rolf Moebius
as Duke of Reichstadt
Paul Hoffmann
as Metternich
Liselotte Schaak
as Therese Elssler - Fannys Schwester
Ernst Karchow
as Dietrichstein
Walter Werner
as The Maestro Foresti
Ernst Sattler
as Kammerdiener Lindner
Hubert von Meyerinck
as Polizeipräfekt
Werner Kepich
as Französischer Revolutionär
Hubert I. Stowitts
as Der Prinz im Ballett
