George Helmut Lang helped install the most successful double agent in history into the German military intelligence network, a betrayal kept in a personal file for decades.
German intelligence was fed a torrent of state-authored falsehoods by Juan Pujol Garcia and other assets whose survival depended on the success of the deception.
Juan Pujol Garcia deceived the RSHA from within, turning their own intelligence services into a vehicle for their undoing while Schellenberg's attempt to professionalize the lie failed.
German High Command was deceived by a double-cross system and false channels that held their attention while the real Allied invasion fleet crossed the Channel.