Just before Christmas two colourful owls appear on Onni's home yard. The birds ask Onni to follow them to Korvatunturi where his help would urgently be needed. Despite being afraid, Onni joins the owls. As they get to Korvatunturi, Onni learns that he is the only one to challenge the Lappish Sorceress and her wicked deeds in Santa's country. He will need to muster up all his courage to fight the magical powers of the witch.
Onni and the Spell of the Lappish Sorceress is a winter adventure story that takes place in the land of Santa Claus. The story has magical powers, fairytale characters and a northern feel.