Lights Out

Martin, a young boy, is being terrorized at night by a shadowy figure — a woman-shaped thing that appears only in the darkness and vanishes the moment light hits it. His mother Sophie has been talking to this presence, seemingly comforted by it. Concerned, Martin reaches out to his adult half-sister Rebecca, who left home years ago to escape their mother's instability.

Rebecca investigates the entity, which they learn is named Diana — a real woman who was a patient at the same mental health facility where Sophie once received treatment. Diana had a rare condition that made light physically painful, and she died during an unauthorized experiment at the facility. She has remained attached to Sophie ever since, bound by their shared history and feeding on Sophie's depression. Diana is violently protective of that bond, and anyone who tries to pull Sophie away or bring Martin to safety becomes a target.

As Diana's attacks grow bolder, Rebecca and her boyfriend Bret work to protect Martin while Sophie spirals deeper. The film builds toward a confrontation that reveals the only way to free the family: Diana cannot exist without Sophie's grief anchoring her to the world. Sophie, understanding this at last, makes the choice to sever the connection herself — sacrificing her life so that her children can live in the light.