A tragic fire in a mental hospital killed countless people, and Nell Sweet (Ashley Bell) survived as the only survivor. On this day, Nell, who had no consciousness, suddenly woke up. She had forgotten what happened in the past few months, and only had a vague memory of the horror of the devil. Frank Mueller (Muse Watson) took her back to the trauma girl care agency he founded, hoping to help Nell stay away from the influence of the cult through scientific methods and regain a healthy and normal life. With the help of Frank, Nell tried to believe that the so-called supernatural was just a fantasy. She made friends with the beautiful girl Gwen (Julia Garner) and had a good impression of a boy named Chris (Spencer Treat Clark). However, the devil did not forget its easy prey, and was gradually covered by the bone-chilling cold horror shadow in the sun...