Trevino has written a book about medieval Spain, Casilda of the Rising Moon, that tells the story of a Moorish princess who becomes a saint. Nacar, the White Deer is based on a historical event, the sending of an albino deer from the Philippines to Mexico in the seventeenth century. A story of daring and action, it is aimed at a somewhat younger audience than is I, Juan de Pareja. Beyond the Gates of Hercules is a fantasy about Atlantis that tells of the destruction wrought by a power-mad dictator.