American-born codebreaker extraordinaire, Maggie Hope, must stop a traitor from uncovering England’s most dangerous secrets during World War II.

It’s springtime in Paris, 1942. The Nazis have captured one of England’s most intrepid spies, who soon discovers that the Germans have a mole working deep in the British SOE. From Paris, Maggie Hope must unmask that traitor—before the enemy learns WWII’s most deadly the site of the planned Allied invasion in Normandy.