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

At Hell's Mouth, Ronja unearths a disturbing secret about the Borka robbers; in the village, Halvert is under pressure to make the forest safe.

Ronja learns something shocking about the robbers' way of life, while Mattis recruits a new member for the clan; Birk and Ronja meet again.

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.

It's spring, and Ronja and Birk can finally reunite in the Mattis Woods; Mattis suspects that a robber stole food from the pantry during winter.