This unique book is one of the handful of all-time great books on intelligence. It ranks alongside Kahn's The Codebreakers and Hitler's Spies, Hinsley's great history of British intelligence in WWII, Masterman's Double-Cross System, James Bamford's books, and some of the books by Christopher Andrew and Nigel West. And it is also a tremendous contribution to the history of World War II. The paper cover quotes two of the greatest authorities on WWII, Sir Michael Howard and Prof. Ernest May, saying that it is an essential addition to any WWII collection and they are right.
Any reader about WWII knows about a few of the deceptions the Allies brought off such as the one at D-Day and "The Man Who Never Was". Holt not only gives far more information about these than has ever been published. He also puts them into context as part of the overall history of Allied deception and how it developed from 1940 to 1945. And he has a huge amount of absolutely new information. This is especially true as far as U.S. deception, which has never been written about previously. Holt was allowed to use files in the Pentagon which had never before been declassified and he made the most of them.
As an old Naval Intelligence guy I was particularly glad to see the tremendous amount of material never before seen about the U.S. deceptions in the Pacific.
Also, the three appendixes are the kind of material for any student of intelligence history to die for, as the saying is. There is a list of all the Allied deception operations (you will be amazed how many there were), a list of all the Allied double agents and other channels that were played back to the Axis (again, you will be surprised how many of these there were), plus a list of all the phony units (army, air force, and navy, not just U.S. but British, French, Greek, etc. etc.)) that were palmed off on the enemy.
A definitely exceptional feature of this book is not only its complete and detailed history but how readable it is. It is told through the personalities of the American and British officers that conducted the deceptions and they are brought to life the way history books rarely do. One of the quotes from experts on the paper cover says it reads like a novel and this is totally true. In this field, in my experience a similar accomplishment has been managed only by David Kahn.
This book is a 100% "must have" for anybody seriously interested in WWII or intelligence.