After the events of The Stone Forest, Hilda and Baba switch species, with Baba turning into a human, and Hilda turning into a troll. Hilda goes on an adventure to find a way to bring herself back human again, with her mother, Johanna, trying to find for her in the mountains. Hilda must find a way to get herself back home as a human, and prevent the citizens of Trolberg from being invaded by trolls.
Hilda and the Mountain King
When Hilda wakes up in the body of a troll, she must use her wits and courage to get back home, become human again and save the city of Trolberg.
