While on a family vacation at the Grand Canyon, a young boy named Michael, who is autistic, stumbles upon an ancient, hidden cave. Inside, he finds and unwittingly takes home a set of mysterious stones adorned with petroglyphs. Unbeknownst to his family, these stones embody the dark spirits of ancient Native American legends. This act inadvertently triggers a series of ominous events, marking the beginning of a terrifying supernatural ordeal for the family.

Upon returning to their suburban home, the family starts experiencing increasingly disturbing occurrences that defy logical explanation. Objects move on their own, menacing figures appear in the shadows, and their once-harmonious home becomes a place of tension and fear. The parents, Peter and Bronny, struggle to understand the nature of the malevolent force that has invaded their lives, seeking help from various experts in the supernatural. As the manifestations of the darkness grow more violent and personal, the family's bonds are tested to their breaking point. They must uncover the secret of the stones and find a way to banish the spirits before it's too late.