Regency England, January 1813: When a badly injured Frenchwoman is found beside the mutilated body of Dr. Damion Pelletan in one of Londons worst slums, Sebastian finds himself caught in a high-stakes tangle of murder and revenge. Although the woman, Alexi Sauvage, has no memory of the attack, Sebastian knows her all too well from an incident in his pastan act of wartime brutality and betrayal that nearly destroyed him.As the search for the killer leads Sebastian into a treacherous web of duplicity, he discovers that Pelletan was part of a secret delegation sent by Napoleon to investigate the possibility of peace with Britain. Despite his powerful father-in-laws warnings, Sebastian plunges deep into the mystery of the Lost Dauphin, the boy prince who disappeared in the darkest days of the French Revolution, and soon finds himself at lethal odds with the Dauphins sisterthe imperious, ruthless daughter of Marie Antoinettewho is determined to retake the French crown at any cost.