Karel Doležal, insurance clerk and exemplary father of a family, leaves for a business trip with his secretary Vlasta. After spending the night together, they both return home. However, thanks to a small moment of inattention, they run over the boys. Karel runs away from the scene of the crime. He won't tell anyone what happened. Then when he reads in the newspaper that the boy did not survive the accident, he begins to feel guilty. He confides in his wife about the accident, not the infidelity. Their son Jirka overhears everything. His father has always been his role model, and that's why he doesn't want to accept his guilt.

A biographical film about the famous Czech painter Mikoláš Aleš, portrayed as part of the vanguard of the working class and a spokesman for the oppressed, who asserts himself despite the opposing bourgeoisie and reactionaries of all kinds. The film focuses on the period when Mikoláš Aleš participated in the competition to decorate the National Theatre.

Many of the young workers at an aircraft factory near Prague are members of an aviation club. On the one hand, there is the responsible Franta, who is highly regarded by his colleagues due to his understanding nature. Opposite him is the talented aircraft designer Ruda, who is also an excellent pilot, but also hotheaded, undisciplined and condescending towards his colleagues. He starts flirting with the glass grinder Lída, although he knows that she is Franta's girl friend. A conflict is not long in coming. When Franta's glider crashes due to a suspected mistake by Ruda, Ruda is banned for a certain period of time. This is fatal, because both young men were actually supposed to represent Czechoslovakia at the upcoming international gliding championships in Poland.