The three Potůčks live in a house in Ouplavice: a widower grandfather, a son whose wife has run away, and a still unmarried grandson. The father works as chairman of the agricultural cooperative, the son leads the local youth and the pensioner grandfather supplies the two of them with lots of witty advice through the trumpet of his inseparable pipe. They've got a lot on their minds right now. Their village is in competition with neighbouring Piscory, and their opponents are using dishonest weapons to fight...