Girona, Spain, 1353. Struggling to save his patients from the plague, and avoiding the even greater danger of his wife's temper, Isaac discovers that pestilence isn't the city's only killer. A nun dies in the public baths. Then it is revealed that she is not a nun at all, but an attendant to the queen-in nun's disguise. The Bishop of Girona calls upon Isaac to help determine the strange circumstances of her death-and the purpose of her deception. But Isaac soon finds himself and his family caught in a tightening web of royal intrigue designed to destroy the Spanish monarchy-and whoever else gets in the way...