Vladimír Dvorský

A socialist drama from the time of the February coup. The owner of the brickyard will use several workers before February in order to subvert worker solidarity and continue to do his black business. However, the vigilance of a young, aware worker prevents him from doing so.

Worker Šebesta does not rejoice with the others in the May Day parade, as his boots are weighing him down. The following working day does not bring him a good mood either. At a plant-wide meeting, he comes into conflict with the young striker Brejcha from the United Engineering Works. He demands an increase in the production of heating elements so that the new hall can be completed before the deadline. The workers react to his passionate speech about the improvement efforts with distrust and, with a bit of mockery, challenge him to prove his words with action in their plant...

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...

Thirteen-year-old Jenda, whose father is the leader of an illegal movement in a small town at the end of World War II, proves his bravery and sense of duty when, despite all the dangers, he delivers an important message to the partisans.