The soldiers of Operation Gunnerside are forced to jump far from their originally planned landing zone. For days they fight their way through the snowy mountains until they finally meet the men from "Grouse". In the meantime, Heisenberg has been put in charge of the Kaiser Wilhelm Institute and now has unlimited resources at his disposal for his research. Meanwhile, the men of "Gunnerside" cross the gorge that lies below the plant in Rjukan...