In a world struggling to understand the true extent of evil, a new chapter begins years after the terrifying possession of Regan MacNeil. The young woman has managed to reclaim her life, but the aftermath of her experience continues to haunt her. Meanwhile, a defrocked priest, Father Marquardt, is sent to investigate Regan's mysterious stigmata and discovers that the darkness that tormented her has not vanished but has found new ways to manifest itself.
As Marquardt delves into Regan's life, his search for answers leads him to a dark cult seeking to resurrect the demon that once left her. Armed with psychic technology and surrounded by an increasingly unsettling environment, the priest begins to experience disturbing visions that challenge his faith. Regan, for her part, struggles between the memories of her horrifying past and an uncertain future, as the forces of evil surround her once again.
The film explores the dilemmas of faith against deception, and what can happen when demonic forces try to regain control. With unexpected twists and a bold approach to the struggle between good and evil, the story reaches an intriguing climax as the characters attempt to unravel the truth behind the darkness that seems unwilling to disappear. In the end, the quest for redemption and the battle against one's own shadows become the true terror they face.