An elite force of Norwegian resistance fighters returns to their invaded homeland to carry out one of the most daring and significant acts of sabotage in World War II. During what could be a suicide mission, they must raid and destroy the heavy water production facility at the Vemork hydroelectric power plant at Rjukan, Norway in February 1943. The Nazis intended the heavy water for nuclear weapons research. The British Special Operations Executive (SOE) named this raid Operation Gunnerside.