The film follows a pilot and crew of a World War II-era Douglas C-47 Skytrain (the military version of the DC-3) who try to survive after a forced emergency landing in the uncharted wildlands near the Quebec–Labrador border. The pilot, Dooley (John Wayne), is a former airline pilot, who, like many others, was pressed into duty hauling war supplies across the northern route to England. Icy conditions force the aircraft to land, and with the difficulties of navigating far from settled country, they can provide only an approximate position to rescuers.