Hello comrades and friends (and everybody else)! I wanted to drop the source list for the most recent History Impossible sooner rather than later, but some things (namely the new puppy roaming the house and getting into all sorts of trouble) got in the way. But as is always promised, here is a comprehensive list of the sources used for Hitler's Bastards.
Adrian Weale, Renegades: Hitler's Englishmen, 1994.
Eric Pleasants (with Eddie Chapman), Hitler's Bastard: Through Hell and Back in Nazi Germany and Stalin's Russia, 1958 & 2012.
Nicholas Booth, Zigzag: The Incredible Wartime Exploits of Double Agent Eddie Chapman, 2007.
Adrian Weale, Army of Evil: A History of the SS, 2012.
Christopher Ailsby, Hitler's Renegades: Foreign Nationals in Service of the Third Reich, 2004.
Rebecca West, The Meaning of Treason, 1947.
(Planning to read; I still don't know how I missed this one): Josh Ireland, The Traitors: A True Story of Blood, Betrayal, and Deceit, 2017.
All books on this list are recommended. Army of Evil is about as comprehensive a history of the SS as there is.