While Canadian history professor Andrew Stanhope is doing research in Paris on the German invasion of France, he stumbles upon an odd and long-lost exchange between Colonel Marius Michel, principal deputy in France's counter-intelligence agency, the Deuxi?me Bureau, and the Directeur-G?n?ral of the Val de Gr?ce military hospital. The Colonel wants the Directeur to warn the incoming Prime Minister, Philippe P?tain, that there is an active spy in the French war ministry and that the Marshal's own ring of advisors includes at least one Nazi sympathizer. By means of alternating flashbacks between 1940 and the 1970s, the author uncovers Michel's attempts to track down the traitor and other collaborators whose espionage may have led to the sudden and ignominious defeat of France. Working undercover, and with his life definitely at risk, Michel follows a trail that stretches from the heart of the war ministry on the Left Bank of Paris to the bustlng high fashion industry on the Right. It is there, within the Maison d'Ari?ge that he encounters its treasonous owner, Louis Loriot, two beautiful German-born spies, two cases of cold-blooded murder, as well as his own would-be killer. All this, Stanhope pieces together decades later, before making the most startling discovery of them all.