The Prague Research Institute of Air Engineering is to prepare a proposal to reduce dust in Ostrava, especially in the area where the new power plant is to be built. That is why engineers Vojtěch Spára and Jiří Zástěra will travel to Ostrava. Eva Frágnerová, a hygienist, will strongly oppose the power plant project near the housing estate.

Ten-year-old Martin attends religion at school and is always an altar boy at church. That's the wish of his mother Anci, a bigoted believer. However, Martin encounters hypocrisy at every turn and begins to doubt that God exists. His older brother Eda steals money from his father with impunity, his father steals materials from the cooperative building, and even Martin's best friend Kovajs "sins" without scruples. Pastor Hornof tries in various ways to maintain his influence over his sheep, but is hindered by people with a "progressive" socialist mindset. When Martin's beloved Angora rabbits, who have done nothing wrong to anyone, die, the boy's faith is clear. He decides to join a pioneer organisation. All that's left is to keep it a secret from his mother...

A story about a group of countryside children and their pony.