Zwierzolas is home to many small creatures: mice, squirrels, birds. They do not always feel safe in it - they must be careful not to be eaten by bigger and stronger predators. Especially fierce is Rudolf, who loves to hunt - seemingly - defenseless mice, such as Grandma Myszomędrka's grandmother. This attempt leads to a true revolution.
 
Mice with friends decide to act! They want to introduce a law on the life of all animals in agreement and stop eating one another. Convincing predators to a new idea will be a real challenge. Time will tell if they will cushion him.