Andrew Chandler & Fabian Von Schlabrendorff 
Secret War Against Hitler [PDF ebook] 

One of the few survivors of the German Resistance, von Schlabrendorff traces his anti-Nazi activity from his student days in the 1920s, through Hitler’s rise to power, to the war and his involvement in the July 20, 1944, plot. He vividly recalls the double life of the Resistance leaders during World War II, the futile secret meetings of the conspirators, and their efforts to enlist the aid of weak and vacillating German generals.