Unlike the SS, SD and Gestapo, the Abwehr was not recognized as a criminal organization, although its role in ensuring Hitler’s aggression cannot be overestimated—it was not for nothing that “Abwehr” (translated from German as “defense” or “rebuff”) was called “the shield and sword of the Reich”, “the all-seeing eye of the Fuhrer” and even “the best intelligence service of the Second World War”. This book is a unique opportunity to look into the holy of holies of German intelligence and counterintelligence, behind the scenes of the secret war, into the special storage of secret operations and sabotage units, such as special purpose regiment "Brandenburg". As a career intelligence officer who served in the Abwehr for 10 years, Lieutenant Colonel Buchgait had all the information and in his professional research, based not only on personal memories, but also on archival materials and post-war conversations with hundreds of former colleagues, he restored the true history of this legendary intelligence service from its takeoff before the fall, from the birth of the Abwehr to its defeat after the assassination attempt on Hitler in the summer of 1944 and the execution of Admiral Canaris.