Abandoning her philandering husband, Olivia enters a world rife with superstition and depravity: the convent of Saint Dulcinea, behind the walls of which persist strange and perverted rituals reminiscent of the Middle Ages, when harsh discipline and torture ensured absolute obedience. Under the constant supervision of the nuns she is subjected to continual punishment and humiliation. Gradually she learns the true and terrible purpose of their intentions, which are not for her benefit, but to ensure the survival of the convent. Olivia is driven to desperate measures, but the nuns are always one step ahead. Perhaps there is no escape from the dark terrors of the Dulcinites...