Joan Huntar (Kristen Anne Ferraro), a real estate developer, buys an old summer camp with a dark history of supernatural worship and human sacrifice. A celebration weekend turns deadly when construction uncovers the mythical Stonehenge of America, awakening deadly spirits that kill to gain control of this supernatural gateway. Unable to escape, Joan must fight for survival alongside her family and others who are trapped. Judd Hirsch plays Carl Turner, a man whose presence seems to be threatened by the supernatural forces at play.