Jens og Isak på tynn is

18 half-wild dogs who love to fight; there are great forces that Jens and Isak must master if the dream of a dog team in Greenland is to become a reality.

Isak defies the Inuit's warning, and ends up in an area with open sea and ice. Jens must choose whether he should follow his friend, and thus expose himself and the dogs to mortal danger.

In Toku's sewing room, the regime is brutal and they are given some unexpected challenges by "Mother Greenland". The boys let loose at a party and learn to hunt seals.

The mighty narwhal pushes its way under the life-threatening spring ice. The boys go hunting, how does the Greenland adventure end for Jens and Isak?