The Greatest Double Agent of World War II. How Juan Pujol, a Spaniard, became an Abwehr spy and a British double agent for MI5 to dupe his Nazi controllers over the Allied objective of launching OVERLORD on the beaches of the Pas-de-Calais. Pujol’s co-author reveals how, in 1984, he traced him to Caracas and accompanied him to Buckingham Palace.