A young woman (Teresa Palmer) must protect her brother (Gabriel Bateman) from a terrifying apparition that only manifests in total darkness. Later she realizes that this fearsome entity is connected to her mentally ill mother (Maria Bello) who has started hallucinating conversations with a mysterious figure named Diana. Billy Burke and Alexander DiPersia co-star. Produced by James Wan (THE CONJURING) LIGHTS OUT is a feature-length expansion of director David F. Sandberg's short film of the same name which became a viral sensation online.