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Käthe von Nagy plays Ronny, who designs the costumes for the upcoming premiere of an opera written by the young prince of Perusa (Willy Fritsch) and has to deliver them personally due to the urgency of the commission. Arriving there, the prince not only is charmed by the young lady (who wouldn't?), but also mistakenly believes her to be the famous singer who is to be the female lead in the opera. What Willy does not know yet is that the real singer has cancelled her appearance, and as the state ministers hope to distract him from politics with the performance of the opera, they indeed want Ronny to appear in the show….
When an up-and-coming singer's career is jeopardized by morphine addiction, her brother takes on the ruthless dope pushers who are intent on keeping her hooked.
Ronny is a young designer on her way to the capital of the Ruritanian Kingdom of Perusa with the costumes she has created for the operetta written by the Prince. On her journey, she meets the prince and is persuaded to take the place of the star who had just walked out. The prince falls for Ronny but how can he marry a commoner?
