A woman is possessed by the spirit of her husband's deceased first wife, turning her into a cold, scheming flirt who will stop at nothing to get what she wants. Her sister, husband and new boyfriend struggle with accepting what has happened, who has caused it, and how to correct it, soon bringing them into contact with a coven of devil-worshippers and forces of the supernatural. As they navigate this dark world, they must confront the evil that has taken over their lives, and the true cost of possession.