Lights Out
In a textile warehouse, worker Esther sees a silhouette of a figure when she turns the lights off, but sees nothing with the lights on. She warns owner Paul about the apparition, which he ignores, and leaves. Paul is then chased and gruesomely killed by the figure.
Paul's stepdaughter, Rebecca, lives away from her mother Sophie and half-brother Martin. Sophie suffers from mental illness and a depression that has resurfaced, talking to an imaginary friend. One night, Martin sees Sophie talking to a figure and is horrified, gaining insomnia. Rebecca takes Martin to her apartment to protect him, against their mother's wishes. That night, Rebecca awakens to see the figure, barely avoiding its attack thanks to the building's neon sign flashing through her window. The next morning, Rebecca finds "Diana" scrawled on the floor. She recalls Diana from her own childhood, the reason she left when her father, Sophie's first husband, seemingly abandoned them. Later, she breaks in and sees files about Sophie and Diana, and that Diana was killed when exposed to a bright light during an experiment.
Sophie has a movie night with Martin, but seemingly invites the figure, frightening him. She tells him a story about the figure, Diana, her friend when she was in an institution, who had an unusual condition that made her skin photosensitive. Martin sees Diana crouched above and turns on the light, escaping to Rebecca's before Diana can attack him.
Rebecca confronts Sophie about Diana but she denies the accusations. Rebecca, her boyfriend Bret and Martin decide to stay overnight to protect Sophie. Rebecca goes to her bedroom door to reconcile; however, Sophie secretly passes her a note saying "I need help" before Diana tugs her back in. Rebecca realizes that she is being controlled and turns on all the lights in the house to keep Diana away.
Knowing their intentions, Diana baits Rebecca and Martin into the basement by shorting out the power. Bret is attacked but escapes and contacts the police. Rebecca realizes that using a blacklight can allow them to see Diana and discovers scrawled writings along the wall, explaining how Diana won't let anyone "take" Sophie and that she killed Rebecca's father.
A pair of police officers arrive and free Rebecca and Martin but are killed by Diana. Rebecca sends Martin out with Bret and goes back to rescue Sophie. Diana attacks Rebecca violently, but Sophie confronts her with a gun. Realizing she's Diana's tether to the world, Sophie commits suicide with the gun, which makes Diana disappear. Distraught, Rebecca, Martin and Bret reconcile and vow to stay together.
paranormal, suspenseful