Desperate to reconnect with his wife and son after a violent attack leaves them fear-stricken and traumatized, a father moves his family to a sleepy New England town and finds himself in a fight against supernatural forces hell-bent on tearing them apart.

In the fall of 1976, a small psychology lab in Pennsylvania became the unwitting home to the only government-confirmed case of possession. The U.S. military assumed control of the lab under orders of national security and, soon after, implemented measures aimed at weaponizing the entity. The details of the inexplicable events that occurred are being made public after remaining classified for nearly forty years.