Elizabeth Darcy and her beloved husband Fitzwilliam are taking on the responsibility of finding a suitable suitor for Elizabeth's younger sister Kitty, thereby assuring her a proper place in society.
The angels smile on the young and a perfect match is found, and wedding plans are soon under way. Suddenly a change in personality occurs in Kitty's soon to be model husband – a change so striking as to jeopardise not just the Darcys social standing, but their lives as well.
A mysterious mirror, an insidious reprobate from the past, and matters far beyond the social circles around Pemberly all come into play in a dangerous puzzle, where the consequences may be the exchange of a soul for a soul.