When two sisters emerge from the woods under mysterious circumstances, nurse Shannon's life is upended as she decides to take them in under temporary foster care. She is plunged into a world of legal disputes and threats from their biological parents as the secrets of the girls' past are slowly revealed. Together they will learn to navigate trust and fear as they confront the demons of their past.

While performing an unauthorized exorcism on his father, an elite exorcist suspects the entity he's doing battle with might be a holy being – perhaps even God.