Molly Hartley (Sarah Lind), a young and beautiful woman, celebrated her 24th birthday with her friends in a dance hall. That night, she seemed to be bewitched by some mysterious power, and the whole person became a little confused and unable to control her words and deeds. The next morning, two policemen came to the door and found two bodies in Molly's bathroom. After that, Molly was diagnosed with mental problems and was locked up in a mental hospital. The treatment in the hospital did not improve at all, and Molly's abnormality became more and more severe. All kinds of visions made the woman who served as the attending physician begin to believe that the girl was indeed possessed by the devil. At the same time, the former pastor John Barrow (Devon Sawa) also lived in the hospital. He had experienced an unforgettable failed exorcism ceremony and was now deprived of his priesthood by the Vatican. The mysterious and terrible things in the hospital intensified, and John had to meet the challenge of the devil...