The beautiful young woman Molly Hartley (Sarah Linde Sarah Lind) celebrates her 24th birthday with friends in a ballroom. She seems to be bewitched by some mysterious force that night, and she becomes a little confused and unable to control her words and deeds. Early 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, but Molly's abnormal condition became more and more serious. Various visions made the woman, the attending physician, begin to believe that the girl was indeed possessed by the devil. At the same time, the hospital is also inhabited by former Reverend John Barrow (Devon Sava Devon Sawa), who experienced an unforgettable failed exorcism and is now deprived of his priesthood by the Holy see. The mysterious and terrible things in the hospital became more and more intense, and John had to meet the challenge of the devil.