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It has been five years since Katie (Katie Featherston) murdered her sister and disappeared with her infant nephew in tow. Now, a new family is about to fall prey to nighttime terrors. A mysterious accident leads to teenager Alex (Kathryn Newton) and her family becoming the temporary guardians of their new neighbours son, Robbie (Brady Allen). Cameras installed throughout Alex’s home capture the sinister events that unfold after the arrival of their new guest.