In World War II Norway, heroic British and Norwegian intelligence agents living in the country's desolate wilderness quietly undermined the German occupiers. Their coast-watching intelligence highlighted the movements of the German fleet and led to counter-strikes which sank many enemy ships—most notably the Tirpitz in November 1944. Using previously unpublished archival material from London, Oslo, and Moscow, Tony Insall provides a definitive appraisal of Anglo-Norwegian cooperation.