The film revolves around a convent where a group of beautiful and sinful nuns engage in various forms of debauchery, from romantic trysts to occult rituals. The story follows a newcomer to the convent, Sister Benedetta (played by Anita Ekberg), who becomes embroiled in the nuns' decadent activities. As the story unfolds, the film descends into a world of carnal desires, Satanic rituals, and brutal violence.