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Carl Boyd has produced an exceptionally lucid and revealing book that traces U.S. decoding attack on Berlin-Tokyo radio communications of Gen. Oshima Hiroshi, Japanese Ambassdor to the Third Reich, and its impact on the outcome of WWII. According to Boyd, these decoded diplomatic messages, known in the U.S. and Great Britain as MAGIC, were pivotal in Allied decision-making at critical junctures during the war. The author contends that, because the British were unable to read the secret communications of the top Nazi leadership, MAGIC filled a crucial gap in British ULTRA message decoding efforts. According to Boyd, Oshima was covertly converted into "an inadvertent informer of incalculable importance in leading the Allies to victory." Because Oshima had a very close personal relationship with Hitler and foreign minister von Ribbentropp, had their trust and respect, and had access to their higest level secrets, his MAGIC decoded radio messages were especially revealing and valuable for Allied planners. His military experience and analytical abilities also made his detailed characterizations of the disposition and condition of German forces in Europe and on the eastern front especially enlightening to the Allies and critical to planning for Operation OVERLORD. Boyd observes that "The margin of success on the Normandy beaches was narrow, but MAGIC and Anglo-American cooperation made the difference." Boyd's book is the first detailed account of Oshima's role as a primary source of Allied wartime intelligence through MAGIC. He draws heavily on declassified National Security Agency documents recently released to the National Archives. There is more, however, to this story of decoding covertly collected enemy radio intercepts that remains classified, especially in the British archives, which won't be declassified for more than twenty years. This is a thoroughly documented, superbly written, and rich account of the application of communications intelligence during WWII. It should be a stimulating read for all serious WWII historians and an entertaining read for all others.