"One of the most perverse stories you have ever written, A Mortal Glamour is among the best revelations of the difference between good and evil in fiction," said Douglas Clegg to Chelsea Quinn Yarbro when the novel first came out. Set in southern France at the end of the three pandemics of Black Plague that ravaged Europe in the second half of the fourteenth century, the convent at Saunt-Vitre-lo-Sur shows in miniature the collapse of medieval society, and the chaos an incubus/succubus demon brings to nuns and courtiers alike.