The tales of the double agents featured in this book sound too good to be true, which makes it all the more amazing that they are. Though all six agents were certainly cunning and brave, they could also be irrational, petty, and selfish—essentially, human. All were crucial to the success of Operation Fortitude, the Allied campaign to trick the Germans into believing that the invasion of France would happen at Calais, not Normandy. MacIntyre brings these spies to life through his vivid descriptions, making it clear that despite the sexy job title and sometimes outlandish duties, these agents suffered and sacrificed.
Double Cross: The True Story of the D-Day Spies - Ben Macintyre