The North Bohemian town of Chudoplesy in the middle of the 19th century: the only local industry is the domestic production of reed goods. The poor reeders organize a revolt against the exploitative factors.

The story of young boys who have proven their loyalty to the republic unfolds in the setting of a boarding school for miners' apprentices. A tunnel is dug from the Engels mine to the Ludvik mine, so that the two mines can be connected to form the Engels mine. However, the project is targeted by subversives who want to flood it, regardless of human lives.

The story of young boys who have proven their loyalty to the republic unfolds in the setting of a boarding school for miners' apprentices. A tunnel is dug from the Engels mine to the Ludvik mine, so that the two mines can be connected to form the Engels mine. However, the project is targeted by subversives who want to flood it, regardless of human lives.

At the end of the war, the old train driver Matys saves his beloved locomotive Líza from depth charges. However, the locomotive is damaged and he is injured. At a critical moment, he stands in for his son-in-law, also a train driver, and thus prevents a train accident. Despite this, he is sent into retirement. To show what the "iron old man" can do, he reconstructs Líza with a group of apprentices...

Jindřich Tůma, a partner in the gas mask shop "Asana", has a very energetic wife who promotes a vegetarian diet. The real soul of the company is Ing. Ivan Kareš, who also leads civil defense exercises. On the street, during a practice air raid warning, he sternly reprimands a girl who did not go to shelter. It is Věrka, the Tůma's niece, who comes from the countryside to finish her studies in Prague. Věrka enters the seventh grade and soon shares the enthusiasm of her classmates for an unknown composer whose pseudonym is Michal Marhan. Ing. Kareš gives a lecture on civil defense in the seventh grade and so meets Věrka again. Kareš tries to convince the girls of the necessity of more concrete life ideals. At the premiere of Marhan's operetta "Píseň o štěstí" it turns out that Kareš is the composer. The girls give him a standing ovation. Ivan ignores Věrka, with whom he has recently had a falling out. The stubborn girl therefore leaves for home...

Milada Dvořáková is about to get married to her business partner Dub, a gas station owner. When she catches him hugging his secretary, she breaks up with him. She sets up a rival company, ŽUB (Women at Gas Stations), and employs only single women. Dub also gets into the competitive fight...

Milada Dvořáková is about to get married to her business partner Dub, a gas station owner. When she catches him hugging his secretary, she breaks up with him. She sets up a rival company, ŽUB (Women at Gas Stations), and employs only single women. Dub also gets into the competitive fight...