Matěj Hůrka, a teenage bricklayer's apprentice, a young man who is delicate in matters of love, lives with his grandmother in a country cottage. He struggles with love problems, but waits in vain for some advice as his vivacious grandmother remarries an equally vivacious pensioner. The enterprising eldest generation thus contrasts to some extent with the youth, which is embarrassed.

It is the depths of winter and in the middle of a desolate landscape on a snowy slope stands a log cabin, inhabited by an old man. The man puts his last log into his stove and the warmth of the fire visibly delights him. He rocks his rocking chair energetically and sings merrily. The flames die away and the old man looks around for something to put on the fire. In the end he sacrifices the chair, but soon that too is burnt up. The man tears the remnants of posters from the walls, gathers various rags and throws everything into the stove. Then he takes an axe and gradually chops up the wooden walls of his house, although it is obvious that he cannot win this duel with cruel nature. The fire gradually eats up the planks and beams until the cabin entirely collapses. The man wants to get warm, and so runs around the dying flames. (https://www.filmovyprehled.cz/en/film/396670/the-log-cabin)

The hero, rushing from one misfortune to another, is former accountant Řehoř Maršíček, who after a heart attack, out of fear of death, decides to live a calm, moderate life and follow the principles of a healthy lifestyle. Not to smoke, not to drink, to exercise and eat healthily. He takes up the position of an auditor of patients and hopes that he will have peace in his new job. Instead, he experiences one nervous breakdown after another. He gradually makes one good resolution after another. Řehoř falls into unhealthy food, alcohol and women. In addition, he gradually loses most of his life's certainties, including a roof over his head. The result is a second heart attack, after which the hero promises himself again that he will fix everything and live a healthy life.

An artist's studio is descended upon by a group of retired men and a young mother who agree to model in the nude for money. Comedy ensues as the students and the local bureaucracy react to the models, all in need of extra money. Several running gags border on slapstick as the officials and the students don't know what to do with the nude models.