Basil St. Florian is an accomplished agent in the British Army, tasked with dozens of dangerous missions for crown and country across the globe. But his current mission, going undercover in Nazi-occupied France during World War II, might be his toughest assignment yet. He will be searching for an ecclesiastic manuscript that doesn't officially exist, one that genius professor Alan Turing believes may hold the key to a code that could prevent the death of millions and possibly even end the war.