In D-Day: Intelligence and Deception, Jock Haswell provides a unique account of the intelligence work carried out on both sides of the English Channel during the period leading up to the D-Day landings. The book covers four main aspects of the story. The first, the operational aspect, concerns the problems of landing a huge invasion force on the beaches of a heavily-defended coast, by far the most difficult operation of war, and is discussed with reference to a selection of historical examples.