In the spring of 1942, occupied Czechoslovakia existed under a regime of calculated terror. At its helm sat SS-Obergruppenführer Reinhard Heydrich, one of the most powerful and feared men in the Third Reich. Appointed Acting Reich Protector of Bohemia and Moravia in September 1941, Heydrich had earned a reputation so menacing that he was widely known as "The Butcher of Prague" and "The Man with the Iron Heart." His assassination carried out under the codename Operation Anthropoid would become one of themost audacious acts of resistance in the entire Second World War, a moment when a small band of exiled soldiers struck at the very heart of Nazi power.