Susie's review is a perfect synopsis of this amazing story. It's unbelievable, but true, that EVERY so-called German spy in England was really a double agent working for the Allies. The deception regarding The Normandy invasion was even more unbelievable, as the discovery of any one of the many tricks or agents would have meant certain failure. On the north coast of England, opposite Pas de Calais, the allies built false airfields with fake troop barracks, plywood airplanes, and other imitation military installations, all to convince Hitler that Calais would be the landing point. Because Hitler believed in his spies, it worked and the D-Day invasion succeeded. No longer would this type of deception be possible. Satellite technology and GPS make it impossible. This book covers a very important aspect of World War II history as, were it not for these double agents, we would probably be speaking German today.