A group of village boys found a comradeship under the leadership of the most intelligent amongst them - Pero Krvžica. They decide to renovate the old and abandoned watermill on the outskirts of the village. A discord amongst the villages cause the mill to thenceforth remain unused. The owner of the steam mill benefits most from this situation. To make sure it stays closed, the corrupted steam mill owner is ready to bribe customers. Pero's comradeship does not want to give in under the pressure of corrupt villagers...