A young girl discovers a bewitched necklace on the beach, unaware of the malevolent force linked to it. As she falls under its dark influence, she unwittingly releases a lethal water demon intent on ensnaring her and her loved ones.
A priest with a haunted past and a novice on the threshold of her final vows are sent by the Vatican to investigate the death of a young nun in Romania and confront a malevolent force in the form of a demonic nun.