Six schoolgirls in their early teens are confined to a sinister boarding school where they are intimidated and often abused by the nuns who run the institution. The school's most dreaded nun discovers that one of the girls is pregnant. The outraged nun gives the girl a brutal beating; she pulls the helpless girl into the bathroom and shoves the showerhead into her mouth, turning the water on full blast in order to ''purify'' the expectant child-mother. The girl's five friends, stricken with fear and rage, horrified witnesses to the cruel torture, decide to help their classmate. The following day the nun is found dead. Now, eighteen years later, they know she's back for revenge. And the only way to thwart her plan is to return to the scene of the tragic incident: the boarding school. But the question remains; how do you kill someone who is already dead?

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