The original fantasy book, Ronja Rövardotter, is written by Swedish author Astrid Lindgren, best known for her Pippi Longstocking series, was published back in 1981 and was previously adapted as a live-action feature film in 1984.
Courtesy of Amazon, here’s the synopsis for the original novel:
Ronia lives with her father, a robber chieftain, and his band of men in their fortress on the top of a mountain. On the night Ronia was born, a bolt of lightning split the stronghold in two, leaving a huge chasm – Hell’s Gap – in between.
Soon Ronia is old enough to explore the forest around her, but she must beware of the grey dwarfs