Germany under Napoleon. Johanna is travelling by stagecoach when one of its occupants, Major Korfes, is arrested by the French militia. Before capture, he gives Johanna a mysterious letter. To solve the mystery, she joins the German corps as the “Black Hunter”. A fantastic breeches role for the lesbian Marianne Hoppe, who two years later, married her gay film partner Gustav Gründgens to prevent persecution by the Nazis.
The operetta composer Robert Ottmar is fascinated when he discovers a picture of a young lady in a newspaper. The beauty's mere countenance inspires him to write a new operetta, which is very successful. Ottmar learns that his beloved is called Gloria and is the daughter of a general manager from Nice. In order to find out whether Gloria corresponds to his ideal image in reality, he hires himself out as a valet in her father's villa - incognito, of course.