The group of fighters of the Norwegian resistance receives a task to reach the northwest Norwegian coast on the vessel "Brattkholm" and to commit diversion on one of the German aviation bases. But the mission came to grief in the sea: the vessel was attacked by the German ship and sunk. Jan Bolsrud was the only person who managed to escape. He manages to reach the coast and to run towards the Swedish border. Pursued by Gestapo, Bolsrud looks for a shelter in mountains. Here it is overtaken by a blizzard, he hides in a cave which appears a deadly trap.