In the early 1970s, a small congregation known as the Children of Light withdrew into the pine woodlands of the southern states. Led by Reverend Jedediah Hale, they sought purity through isolation and sacred devotion. Few outside the valley ever saw them again.

Two 12-year-old girls go camping with Dylan, their big brother. Their peaceful forest trip becomes terrifying when they encounter the Pigman, a menacing figure who hunts them through the woods.