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...

In a wooden hut used as a canvassing center, members of a children's puppet-theatre group are rehearsing for a production about a journey to the Moon. The goings-on inside the hut and outside are being closely followed by amateur detective Pepik Barnabás. He, however, is the first to be under suspicion when a trunk containing puppets goes missing. The children follow him but, when they catch up with him, they discover he hasn't got it. Pepík offers to help them in their search.