Young Ronja learns to protect herself from the dangers of the Mattis Woods while Borka and his robbers cause Mattis trouble.

Ronja and Birk secretly spend their autumn days together in the forest, while Mattis creates obstacles for Borka. Cappa has a new plan.

Winter separates Ronja and Birk, who must remain inside the Mattis Fortress and the Borka Keep. Ronja learns why her father hates Borka.