John is described as a working-class Londoner with deadpan humor who is a mysterious conman and occult detective
haunted by the recent loss of a young girl's soul. No stranger to the dark underworld that exists parallel to our own, Constantine has been studying the dark arts since he was a teenager. He's taught himself spells, rituals, curses and conjuring, but the one person he most wishes to see -- his mother, who died giving birth to him -- remains out of reach, at least so far. When Liv, the daughter of a late friend, is targeted by demons, Constantine steps in to save her and the two form an alliance.