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From producer James Wan (The Conjuring) comes a tale of an unknown terror that lurks in the dark. When Rebecca left home, she thought she left her childhood fears behind. Growing up, she was never really sure of what was and wasn't real when the lights went out and now her little brother, Martin, is experiencing the same unexplained and terrifying events that had once tested her sanity and threatened her safety. A frightening entity with a mysterious attachment to their mother, Sophie, has reemerged. But this time, as Rebecca gets closer to unlocking the truth, there is no denying that all their lives are in danger... once the lights go out.