A group of village boys found a gang under the leadership of the most intelligent amongst them – Pero the Lump. They decide to renovate an old and abandoned watermill on the outskirts of their village. A discord amongst the villages have caused 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 gang does not want to give in under the pressure of corrupt villagers…