The truth behind the Japanese attack on Pearl Harbour; the biggest intelligence double-cross of all time; how the Allies fooled the Germans on D-Day; the modern spy secrets of the Russians.

          The history of codes and cyphers, from the time of the Greeks to present day, is detailed in this outstanding work. With emphasis on the development of modern intelligence, the book describes their use in individual undercover operations. Interviews with past and present members of the defence establishment and secret services throw light on top secret strategies of warfare, which can make the difference between victory and defeat.