Teenagers Jared and Hayden look forward to a carefree summer, but the murder of a neighbor leads to a terrifying encounter with the supernatural. After breaking into the neighbor's apartment, Jared and Hayden find a collection of ritualistic art and other bizarre items. Soon after Jared takes a journal of occult writings, he finds a strange mark on his arm. His subsequent erratic behavior leads Jared's friends and family to the realization that he is possessed.