"In our time, boy," the old man had said, "it's important - vital - to trust no one." The German-Norwegian Johann Göbbs does well to adhere to his grandfather's maxim: Trust no one! As a spy for the Allies during the turmoil of the waning Second World War, he serves as a member of the Luftwaffe in the Reich Ministry of Aviation - constantly in danger of being uncovered. His mission: to gather information about a secret Nazi project. To do this, he must penetrate deep into their hated structures. The secret project north of Berlin - a new type of aircraft - turns out to be just the beginning of something much larger, something that could fundamentally challenge the emerging post-war order. Where do the airplanes disappear to? To the legendary Alpine fortress? Do they have anything to do with the mysterious disappearance of high-ranking military officials?.