A cousin of Georgia’s dear friend, Lady Phyllida Monthalf, is brutally murdered in her home during the theft of blueprints of a new battleship designed by her husband—who now stands accused of her murder…and treason. The Duke of Blackford, in service to Whitehall, enlists Georgia and the Archivist Society to assist in the investigation. Playing the part of the duke’s new paramour, Georgia gains entry into the upper echelons of London’s elite, where amidst elegant dinners and elaborate parties a master spy schemes to lay hands on the stolen plans.