It is 1942 and Norway is under the thumb of the Nazis. In a Norwegian factory, Nazis are producing "heavy water," an essential element in the production of atomic weapons. Harris, leader of the Norwegian underground, is enlisted by British intelligence to aid in destroying the factory.
Harris and Douglas, a scientist, are first instructed to infiltrate the factory and await an invasion of British commandos. The raid is aborted, however, and Harris and Douglas destroy the room where the "heavy water" machinery is kept. Douglas is wounded and captured, but escapes, joining Harris
and learning that the sabotage only causes a minor delay for the Nazis. A British attemp...