At the beginning of the fifties of the 20th century, shortly after the founding of the Unified farmers'cooperative in the town of Mezilesí, there is shot dead a functionary Málek by three unknown men. From the Prague headquarters of the police there are sent to the village two investigators, Lanka and Malinák. The only one trace of the bandits are cans found in a desolate stone-pit in the surroundings of Mezilesí.