The Catholic church has set up a secret order to deal with demonic activity and possessions lead by Father Merrick, a man with a long secretive past, and his ever-watchful assistant, Sister Margaret Day. Together they oversee and advise their unique charges: Kord, an 11th century stone golem that has converted from Kabbalah to Catholicism, and Harley, a teenaged genetic creation formed by the combining of human and reptile DNA.