Walter Schellenberg
Bunich's "Operatsia Groza'" is full of yet unknown facts about the Third Reich. For example, he reveals why Reinhard Heydrich was replaced as the head of the "SD" ("Sicherheitsdienst") by Walter Schellenberg and was made instead the Governor General of Bohemia: This happened because his major rival Admiral Canaris showed Hitler the file of "Chaijm Aaron Heydrich", Heydrich's grandfather, a first violinist in the Vienna "Hofoperette" - and who was Jewish.