Sara, an eight-year-old girl is kidnapped and taken to Blackmarsh, an estate in rural Victoria. There she is forced to join a cult led by the charismatic Adrienne. It strives to raise children pure and untouched, away from the stifling rules of society. Sara's disappearance brings back memories of a woman who was once a member of a female-led cult. She is forced to confront the nightmares of her past in order to stop the cult that plans to kidnap even more innocent children in the future in order to achieve her ultimate goal.