The Catholic church has set up a secret order to deal with demonic activity and demonic possession. Led 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 the Kabbalic teachings to Catholicism and Harley, a teenaged genetic experiment wherein scientists spliced human DNA with that of several reptiles. Harley was discovered in the hills of Argentina by Father Merrick who had been called there to exorcise a demon but inadvertently found the son he never had. The first task set forth for this unlikely duo is to battle the demonic forces of Hell, the Seven Deadly Sins.