Tough, naughty, quick-witted and brave Lillebror has just moved, and has not made any new friends yet, when his imaginary friend – the wooden twig Knerten – appears in the middle of a pile of firewood...
Lillebror moves with Twigson and his family to the western part of Norway, but he dreams of even bigger expeditions, like going to the North Pole.
When Lillebror's mother is mysteriously hurt in a biking accident, Lillebror and Knerten turn the town upside down trying to find the culprit.
