Mia (Ella Purnell), a beautiful 13-year-old girl, accidentally found a small box in a tree hole in her yard, which contained a strange and terrifying story. The story tells that the faceless demon wants to be recognized by others, so he looks for children standing in the window, takes them away, tears off their faces, and sticks them on his face. Mia is fascinated by this unfinished story, and she tries to continue writing it. Mia doesn't know that this is a story written by her father John Ferro (Clive Owen), a construction worker, in his childhood based on his real experience. In the process, strange dreams continue to trouble Mia. At the same time, an accident revived John's deep fear, and he recalled the faceless demon in his childhood. The father and daughter were both harassed by the demon at the same time...