The realm of trolls

Sonja, Espen, and Lotta embark on a dangerous journey into the troll mountain. A surprising ally joins them on their quest, but will their combined forces be enough? Can they best the gigantic trolls and make it out of the mountain alive?
The Northern Lights series by Malin Falch (b. 1993) is inspired by Norwegian fairytales. Northern Lights Book 4 is her sixth published work.