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.

The management of the Meteor motorcycle factory is forced by a representative of the central headquarters to accept the expensive design of a racing machine and abandon the unfinished prototype of a folk motorcycle of their own design. However, the factory's workers and technical team decide to complete the prototype of the "Pepíky", as they call their five-hundred-horsepower motorcycles, ahead of schedule.

A poor musician with a good heart, as a reward for sharing even the last piece of bread despite being hungry himself, is rewarded with a miraculous napkin on which the best delicacies appear. However, a greedy innkeeper steals it from him along with a miraculous donkey from which ducats are pouring...