At B&N Reads he tagged his "five favorite spy books — three nonfiction, two fiction." One title on the list:
Hitler's Spies: German Military Intelligence In World War II by David KahnRead about the other entries on the list.
After primary sources (memoirs and official archives), the principal aid for military studies is the work of scholars like David Kahn. His 650-page tome, Hitler’s Spies, is the finest overview of German espionage in World War II.
Here you’ll find useful details on intelligence chiefs Schellenberg (S.D.) and Admiral Wilhelm Canaris (Abwehr), lists of German officers working in various countries (one of which helped me to identify a Madrid Abwehr agent in The Princess Spy), as well as in-depth discussions of Britain’s most valuable double agents.
Kahn spent eight years researching this book and it’s a treasure trove for WWII buffs.
--Marshal Zeringue