Sinister

Found footage helps a true-crime novelist realize how and why a family was murdered in his new home, though his discoveries put his entire family in the path of a supernatural entity.
Once you see him, nothing can save you.
An American supernatural horror film series that begins with fictional true-crime writer Ellison Oswalt who discovers a box of home movies in his attic that puts his family in danger. A sequel follows James Ransone the Deputy and a mother whose sons are tormented by the ghostly children taken by Bughuul at their rural farmhouse.