Following the death of their mother, two young sisters are sent to live with their estranged Aunt Beth in her isolated, old house. They soon discover that all of the mirrors in the home are either covered or hidden, a precaution their aunt has taken to protect them from a sinister force. However, when one of the sisters uncovers a mirror in the basement, she unknowingly unleashes a malicious demon that begins to torment the family. The sisters and their aunt must then confront the evil presence and the dark family secrets connected to it.