Demonologists Ed and Lorraine Warren take drastic measures to contain the malevolent doll Annabelle, sealing her in a locked artifacts room after a priest's blessing. However, their precautions quickly unravel as Annabelle stirs dark spirits within the chamber. These malevolent forces turn their attention to the Warrens' ten-year-old daughter, Judy, and her friends, plunging them into a night of terror. As the supernatural chaos unfolds, Judy must rely on her courage and resourcefulness to confront the unleashed horrors and protect those she loves.