Plot: Peter and Bronny Taylor go on a trip to the Grand Canyon with their daughter, Stephanie, and Mikey, their autistic son. Mikey discovers a small cavern, where he finds rocks with glyphs on them. He takes the rocks, keeping a secret untold. When the Taylors return home, strange things begin to happen..
Alternative Plot: An invisible monster torments a boy living with his father, brother, and sister in a house in the woods; the family must be kept in isolation to avoid a deadly threat.
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