A time-dilapidated mansion on one of the quiet streets of the aristocratic district of New Orleans, owned by the Mayfair family, is shrouded in mystery, for mysterious events are taking place within its walls, and a strange man is wandering around the garden, whom only a select few can see. What are the inhabitants of the old house hiding? And why has this ancient family clan attracted the attention of agents of the Order of Talamasca, which studies supernatural phenomena, for many centuries?