A priest with a haunted past and a novice are sent to investigate the death of a young nun in Romania. They must confront a malevolent force in the form of a demonic nun. Set in 1952, they uncover the dark secrets of the abbey and face supernatural entities in their quest to stop the evil.
In 1956, a priest is murdered, and an evil force begins to spread. Sister Irene is tasked with facing the demon nun Valak once again in the sequel to the worldwide hit.