The times of serfdom in Latvia. Brothers Tom, Michelis and Andris, driven to despair by the cruelty of the Dormuizh landowner, decide to start a liberation struggle. Tom and Michelis go into the forest and tame a wolf pack there. Taking advantage of the folk legend that a person can turn into a werewolf and live in his guise, the brothers intend to fight the German barons with the help of a wolf pack controlled by them and a messenger Andris, who has remained in the village for the time being...