'Hitler's Spies' details the complex organizational history of what amounted to the German intelligence apparati of 1914-45, their tactical achievements, their strategic failures (USA/USSR underestimation, African/Normandy invasions) and how and why their performance differed so from that of the Allied Powers. The detailing of organizational structures appears thorough--too thorough for the general reader but likely appealing to serious students. The history breaks off after Normandy for no apparent reason. I, for one, would have been interested in role of intelligence in the Battle of the Bulge. Still, this is an intelligent account of what is covered, sufficient to the points perspicatiously elaborated in the author's concluding Epilogue.