As wounded veterans face new dangers and old grudges, it will take a gentleman thief to save the day, in this mystery set in WWI Paris.

Capt. Patrice Beval knows very little about Coralie, the volunteer nurse who saved his life. All he knows is that he loves her—and that her life is in danger. With the help of his fellow injured veterans, he vows to keep her safe. But who will protect him from men who will stop at nothing to get what they want? And what has happened to the great Gentleman Burglar, Arsène Lupin?

Making his triumphant return, Lupin is called upon to solve the disappearance of three hundred million Francs in gold and the murder of a Moroccan man. As his investigation leads him to Captain Beval and Coralie, Lupin concocts an audacious plan to protect the innocent, catch the culprit—and find the loot!