The heart-pounding history of how Pope Pius XII -- often labeled "Hitler's Pope" -- was in fact an anti-Nazi spymaster, plotting against the Third Reich during World War II. The Vatican's silence in the face of Nazi atrocities remains one of the great controversies of our time. History has accused wartime pontiff Pius the Twelfth of complicity in the Holocaust and dubbed him "Hitler's Pope." But a key part of the story has remained...