The morning after their blunder, the resistance fighters are attacked by a German vessel. The Norwegians' boat contains 8 tons of explosives intended to destroy the air control tower. The commandos explode their payload, and Baalsrud and some other survivors flee. They swim ashore in ice cold Arctic waters. Baalsrud is the only one to escape the Nazi roundup. Soaking wet and missing one shoe, he escapes up a ravine, and shoots and kills a Gestapo officer.

Baalsrud evades capture for roughly two months, during which time he suffers from frostbite and snow blindness. He fails in his bid to reach the border of neutral Sweden and throws himself on the mercy of some Norwegians who have access to the Norwegian underground. While hiding in their barn, he amputates most of his frostbitten toes with an ordinary knife, because gangrene has set in.

The fellow Norwegians manage to move Baalsrud close to the Swedish border, but are forced to leave him in a snow cave for roughly two weeks. They made a new plan to get him over the border, having him transported by a reindeer herder, who finally gets him across the frontier to safety.

Baalsrud recuperates in a Swedish hospital for seven months. He returns to England through South Africa, Asia, Australia, New Zealand, and America before rejoining the fight (fonte: Imdb)