The Third Reich is Listening: Inside German Codebreaking 1939-1945 By Christian Jennings 351 pages This book focuses on the German side of code-breaking, working on the British, Russians, American, and French codes. Starting from WWI, where enigma was first developed to Wilhwlm Tranow, who develop B-Dienst. Talked a little about how the enigma works and diffrent varients that where used from Luftwaffle, Kisermarina, Heer and OKH but the majority on how B-dienst at work from Pre WWII, Poland, France, Russia, North Africa and RN and RAF. On all the WWII military history books I have, i just could not stop reading this book. And I have a short attension spaned on reading too. Highly recommand