While flying supplies to England during World War II, Capt. Dooley (John Wayne) is forced to crash land his plane in the icy wilds of Canada. Together, Dooley and his hardy crew struggle to survive in uncharted territory -- with the arctic temperature steadily dropping. Meanwhile, back at the army headquarters in Maine, Col. Fuller (Walter Abel) rallies his capable crew in a desperate search for the downed airmen, knowing that every second counts.