Lawyer Irene (Laura Linny Laura Linney) receives a lawsuit. A priest used religious methods-exorcism rituals to treat the girl Emily's serious illness, which delayed Emily's correct medication. In court, a dispute between religion and science began. The beginning of the incident stems from the terrible experience of Emily (Jennifer Carpenter Jennifer Carpenter), a 19-year-old female college student. When she was sleeping in her college dormitory, she felt invaded by psychic demons, and then more frightening things happened one after another. Emily is not normal, she becomes black-eyed and behaves strangely, living in a nightmare full of hesitant demons all day long. Emily can't control her will and is miserable. Her family brought in a psychiatrist for her, but there was no improvement. Helplessly, please come to the priest (Tom Wilkinson Tom Wilkinson) to find out, only to know that Emily was possessed by six ancient demons. With all kinds of demons, she can escape only through exorcism through religious rituals. The priest's exorcism did not save Emily and led to charges. Atheists, however, believe that demons are haunted.