When Pope Pius XII died in 1958, his papers were sealed in the Vatican Secret Archives. In 2020, Pius XII's archives were finally opened, and David I. Kertzer--widely recognized as one of the world's leading Vatican scholars--has been mining this new material ever since. Based on thousands of never-before-seen documents not only from the Vatican, but from archives in Italy, Germany, France, Britain, and the United States, The Pope at War paints a new, dramatic portrait of what the pope did and did not do as war enveloped the continent and as the Nazis began their systematic mass murder of Europe's Jews. The book clears away the myths and sheer falsehoods surrounding the pope's actions from 1939 to 1945, showing why the pope repeatedly bent to the wills of Hitler and Mussolini. Just as Kertzer's Pulitzer Prize-winning The Pope and Mussolini became the definitive book on Pope Pius XI and the Fascist regime, The Pope at War is destined to become the most influential account of his successor, Pius XII, and his relations with Mussolini and Hitler.