The story of how Britain's intelligence operatives, experts and special operations teams contributed to the Allies' victory in the Second World War.

Codebreakers and Spies tells the astonishing story of how Britain's intelligence operatives, experts and special operations teams contributed to the Allies' victory in the Second World War. The work of the Bletchley Park codebreakers in breaking the German Enigma cipher is estimated to have cut the length of the war by around two years, saving countless lives, while the Double Cross system, in which German secret agents were "turned" by the British to feed their Nazi agent-runners with false information, ensured the success of the D-Day landings.