Twenty-seven years after the fall of Constantinople... Caterina, Countess of San Florian, keeps a book of important things she's learned, from poison antidotes to cosmetic recipes, from charms for toothache to ways of raising and commanding demons. Having a reasonable care for her soul, she has never actually tried demonic magic. Yet. Gian, captain of her personal guard, has an innate magical talent that does not rely on incantations,...