The opera singer Maddalena had been cast out by her family after they learned she was to bear the child of a banker, von Keller, who had seduced and abandoned her. Her return to her native city has her father warn her to remain away, because she is a threat to her family, and her sister Marie's wedding. However, von Keller threatens the reputation of her family with an underhanded banking scheme. He commits suicide, and Maddalena is reconciled with her family.

The setting is Lugano (Switzerland), where an apparently very important world conference takes place. The film tells the story of the young Kitty (Hannelore Schroth), who works as a manicurist at the Eden Hotel, and who in the course of events gets to know both a young journalist (Christian Gollong) and the English minister of economics (Fritz Odemar). A lot of wild mix-ups, comic situations, a love story and occasional singing ensue, and in the end most of the VIPs have gained their share of laughter… There’s also a great performance by Paul Hörbiger as the hotel porter. For a 1939 film made in Germany, “Kitty” is remarkably irreverent and satirical about politics.