The English mission fails and the allies now wants to bomb the heavy water plant. Leif Tronstad persuades them to submit a Norwegian special force group to blow up the factory. Tronstad collect saboteurs, name the group Gunnerside and start training.

The Germans are hard at work rebuilding the heavy water factory after the sabotage. CEO Henriksen at Norwegian Hydro discovers that he is dangerously close to be labeled as a war collaborator and tries negotiate his way out. In England the Americans decide to bomb Rjukan and the factory at Vemork.