London’s social season is in full swing, and the aristocracy can’t stop whispering about a certain gentleman who claims to be the direct descendant of Louis XIV and Marie Antoinette. Drawing rooms, boudoirs and ballrooms are also abuzz with the latest news of an audacious cat burglar who has been making off with precious items that once belonged to the ill-fated queen.

But light gossip turns serious when the owner of one of the pilfered treasures is murdered and the thief develops a twisted obsession with Lady Emily Ashton as a brewing scandal threatens both her reputation and her private life.