In Brighton, England, in 1811, when the wife of an aging marquis is found dead in the arms of the Prince Regent, wearing an ancient necklace with mysterious ties to Sebastian St. Cyr, Sebastian turns sleuth to investigate the woman's death.

London, 1814. When the sadistic Lord Ashworth is found brutally murdered, Sebastian St. Cyr, Viscount Devlin, is called in by Bow Street magistrate Sir Henry Lovejoy to help catch the killer. Just seven months before, Sebastian had suspected Ashworth of aiding in the kidnapping and murder of a string of vulnerable street children. Meanwhile his headstrong young niece Stephanie, who entered into a disastrous marriage with Ashworth, has survived the...