Mary Vogel's investigation of a Virginia farm uncovers evidience of satanic rituals. It also unleases a malevolent spirit that attaches itself to her, filling her days with nightmarish visions and nights with physical attacks. As the demon overtakes her life, her son Josh becomes frightened of her and the relationship with her fiance falls apart. With her formerly deep faith in the Church under assault, it's up to her family and mentor John Zaphus to arrange an exorcism.
