In 1960, a young woman commits a grisly massacre at St. Francis Boarding School, brutally murdering the clergy and nuns inside. Forty years later, college student Clarissa and her fickle friends break into the abandoned convent to tag it with their Greek letters before the Kappas beat them to it. Before long, the group discovers that it's inhabited by demons that are intent on possessing them. As the group dwindles in numbers and the bodies pile up, those who remain uncover the convent's long history with malevolent demonic forces and learn about the buried circumstances surrounding that fateful Sixties night.