3 ideas
Robber chief Mattis captures Birk, the son of rival chief Borka, and holds him as a hostage to force Borka's clan out of the split fortress. Mattis's daughter Ronia jumps across Hell's Gap and surrenders herself to Borka, so each father now holds the other's child. Mattis is forced to release Birk, then declares he has no daughter, and Ronia and Birk flee to live alone in a forest cave.
When Mattis warns Ronia about the river, the chasm and the forest creatures, she does not simply avoid them. She goes to each danger on purpose, leaping the chasm and balancing on slippery stones, to train herself not to fall. Caution is built by controlled exposure to the hazard rather than by staying away from it.
Mattis's love for Ronia is real, but it is fused with his pride and his possessive claim over her future, so her defiance feels to him like a total loss. The reconciliation depends on the humbled parent crossing the distance: Mattis goes to the cave himself and weeps to ask her home. Ronia does not return by submitting to him.