A group of Catholic schoolgirls fall prey to the cruelty and envy of a nun named Sister Ursula. In an act of desperation, the girls end her life by drowning her in a pool of consecrated water. Nearly two decades later, events unfold that free the nun’s spirit, allowing her to seek vengeance. She takes control of Eva, the daughter of one of the girls responsible for her death. To finally put Sister Ursula’s spirit to rest, Eva must be sacrificed.