A nervous private investigator, his bumbling boss, a woman in love, 10,000 Reichsmark and two reversed cases. A crime comedy directed by E. W. Emo.

The seamstresses Franzi and Mizzi have opened up a small shop in a suburb of Vienna. Mizzi is of the opinion, however, that her friend could have a much better life if only she'd marry Karl, the son of the landlord, who has been hot for her for quite a while now. Next store to them lives a rather elegant gentleman, whom Mizzi does not like. One day, an excited woman bursts into the studio, tears off her clothes and begs the girls to act as if they're fitting her for a dress should her husband waltz on in, too. In fact, her jealous husband Stefan does show up and is thrilled to discover that his Gerda isn't cheating on him. But Mizzi and Franzi are positive, that she's been meeting a certain elegant gentleman next door.

After a shady collector of paintings has been murdered, adept Dr. Sebastian Ott discovers a big organised fraud with fake paintings. His twin brother Ludwig is responsible for it, kidnaps him and locks him away in his house. He uses Otts ID and 'replaces' him...

A Hungarian squire and his son compete for the favour of an operetta diva; the younger makes the running. - Unplausible mistakes, small intrigues and a lot of love in an old-fashioned musical comedy with proven comedians.