Spooks: The Unofficial History of MI5 from Agent Zig Zag to the D-Day Deception 1939-45

PO Box 500, London W2; the nondescript address from behind which one of the worlds most famous Secret Services hid: MI5. This book, based on previously secret sources, lifts the lid on Britains Security Service in its battle against German espionage. During the Second World War, the Security Service, through brilliant officers such as Guy Liddell, Dick White and the fearsome spy-breaker, Tin-eye Stephens, commandant of MI5s interrogation centre, Camp 020, successfully ran the Double Cross (XX) system. XX agents such as the dynamic, womanising petty criminal ZIGZAG, the suave TRICYCLE and the aptly named CARELESS laid the basis for Operation FORTITUDE in which MI5s agents BRUTUS and GARBO were central to the success of the greatest deception in modern military history: convincing Hitler that the D-Day landings in Normandy were an elaborate diversion to the real Allied landings at Calais. It was MI5s finest hour.