A construction comedy about the labor struggle of two groups of workers in a Prague factory. The old group is led by the grinder Karhan, while the young group is led by his son. The struggle between the two groups leads to the emergence of socialist competition and cooperation, in which the old share their experience with the young, and the young share their new ideas.

The unfortunate 1930s also befell the student Standa Půlpán. For existential reasons, he had to abandon his studies and entered the mines. However, he only slowly and with difficulty became close to the older miners, rough men who were closed in on themselves. Only his brave stand in rescuing people who were trapped in a mining accident will win him the solidarity of the entire mining collective. Even Karel Čapek's draft once lent itself to promoting an exacerbated class interpretation of social relations.

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While investigating the mysterious death of a teacher, a grizzled detective gets caught up in the world of a high-stakes virtual reality game.