Baron Dolanský is deeply interested in eugenics, he knows what happens when the same plants are crossed over and over again, and he rightly concludes that it will be no different with people. He is a widower and has no descendants, so his nephew Max must provide the future heir to the coat of arms. Fear of possible degeneration compels the Baron to provide the family with new blood. On the other hand, it must not be just anyone - he must at least have certain means. The most serious candidate is the poor but beautiful Madla Lísková, but she should receive preliminary training. The nobleman demands that she stay at his castle for a year. The girl's mother readily agrees, after all, her daughter has a secure future ahead of her. How will the efforts of the Czech Pygmalion turn out?

The owner of a suburban house, Anna Faktorová, makes life miserable for the tenants. There is strict order in the house and the only one who gets along well with Mrs. Faktorová is the parasite and thief Gustav, who informs on the others. An old bachelor named Zajíček, a pawnshop clerk, moves into the attic. After a while, he finds a liking for his neighbor, music teacher Věra Hronová. Grocer Mejstřík is worried about the fate of his shop on the ground floor. Spiritualist Šoltys is forced to pay increased rent when he is caught at a seance, and on top of that, a clock goes missing from his apartment. A dealer later comes to the pawnshop with them. Zajíček recognizes the clock and it turns out that Gustav stole the clock. Zajíček, who has become close to Věra, is jealous when he sees her talking to an older, rich man...

Baron Dolanský is deeply interested in eugenics, he knows what happens when the same plants are crossed over and over again, and he rightly concludes that it will be no different with people. He is a widower and has no descendants, so his nephew Max must provide the future heir to the coat of arms. Fear of possible degeneration compels the Baron to provide the family with new blood. On the other hand, it must not be just anyone - he must at least have certain means. The most serious candidate is the poor but beautiful Madla Lísková, but she should receive preliminary training. The nobleman demands that she stay at his castle for a year. The girl's mother readily agrees, after all, her daughter has a secure future ahead of her. How will the efforts of the Czech Pygmalion turn out?