Dva soupeřící klany lesních banditů, Matis a Borka, bojují navzájem o poklad svých obětí a rozdělují les na dva. V bouřlivé noci se Ronja narodí Mattisovi, vůdci banditů lesního hradu a jeho manželce Lovis, ve stejný den je hrad rozdělen bleskem na dvě části, čímž se vytvoří „pekelná mezera“. Matis, nazývá Ronju největším pokladem klanu.

Ronja grows to be a lively ten-year-old and is given permission to go into the forest.

During her first visit to the forest, Ronja takes in new sights and faces danger.

While practising not being frightened, Ronja is chased. Later, at Hell's Gap, she sees something unexpected.

Ronja learns that Birk is the son of Borka, her father's longtime adversary.

Mattis and his robbers challenge Borka and his robbers at Hell's Gap. Ronja learns more about her father.

Whilst walking through the forest in a thick fog, Ronja is tempted by a sweet, dangerous song.

Mattis tries to drive Borka from the fort while Ronja wonders why she hasn't seen Birk all autumn.

While out practising skiing, Ronja takes a tumble.

Ronja struggles to free herself before heavy snowfall comes.

Ronja falls ill and can't help but worry about Birk.

Determined to see Birk, Ronja works hard to try and clear the rubble that's plugged an underground passage.

Lovis orders all the robbers to wash their dirty bodies in the snow.

Spring returns to the forest, and Ronja and Birk meet two wild horses.

The conflict between Mattis and Borka intensifies, and Ronja faces a horrible sight.

Ronja decides upon a daring act that will change everything.

Ronja returns to the forest and makes a bold decision.

Ronja and Birk hear something moving around inside the cave.

Ronja and Birk have a big argument, sending Ronja from the cave in tears.

Ronja and Birk encounter the Great Harpy as they drift towards Greedy Falls.

Ronja and Birk are startled by a visitor.

As autumn approaches, Birk is surprised by an unexpected offer.

With the forest swarming with the sheriff's soldiers, Noddle-Pete offers a plan, but Ronja has an idea of her own.

A Leader is chosen.

The robbers return to robbing, and Noddle-Pete tells Ronja a fascinating secret.