This book provides a rare opportunity to take an inside look at the work of the most powerful intelligence service in the world, which was the Abwehr until 1944. High-ranking intelligence officers rarely leave memoirs, and if they do, the time for their publication comes decades after the death of all participants in the events. The uniqueness of this publication is that it is based exclusively on documentary materials—interrogation protocols and testimony of senior Abwehr officers during the investigation in Russian and American captivity.