A group of Norwegian resistance fighters is tasked to get to the north-western Norwegian coast on the Bratholm ship and to commit sabotage at one of the German air bases. But the mission suffered a fiasco at sea: the ship was attacked by a German ship and sunk. The only person who managed to escape was Ian Bolsrud. He manages to reach the shore and run towards the Swedish border. Pursued by the Gestapo, Bolsrud seeks refuge in the mountains. Here it is overtaken by a snowstorm, it hides in a cave, which turns out to be a deadly trap.