Pope Pius XII never publicly spoke out against the Holocaust. Why? Did he not care? Was he a coward? Or did he think his silence was saving lives and Catholic souls?

The Vatican and the Nazis have had an uneasy truce throughout the 1930s. But that ends now. As ever more of Europe's Catholics come under attack from Hitler's war machine, the Pope finds himself supporting the German resistance in their plot to kill the Führer.