Pope Gregory XVII has spent a lifetime quietly serving the Church he loves - until he announces a prophecy so alarming that it threatens to tear the Vatican apart. Terrified, the Vatican cardinals imprison him in a monastery. Is he mad, as they believe, or is it all an elaborate plot? An old friend of the pope sets out on a risky quest to find out. On the way, he discovers the power of love and faith, while terrorists and politicians use every deadly and unholy means to stop him.