Expelling a demon from a little girl, Constantine senses power at work that he has not felt before. When he teams up with sceptical policewoman Angela Dodson to discover why her twin sister committed suicide, their investigation takes them into a world of demons and angels existing beneath the streets. But the angels are not always on the side of, well, the angels; and both Constantine and Angela have demons of their own. Caught up in a catastrophic series of otherwordly events, the two become inextricably involved, each of them looking to find their personal peace at whatever cost.