Hub Halloran, a bounty hunter, is resurrected by the devil and becomes a demon hunter, tasked with hunting and killing demons that possess humans and perform ritualistic murders.

Demons possess people and kill their hosts to avoid exorcism, but they also kill additional victims and leave their bodies arranged inside a triangular-shaped design, which Hub interprets as sacrifices.

Hub has complex relationships including with Maryanne, who is involved in his life and the demon conflicts; Lucky, who tried to kill Hub and is later arrested; and Kitty, who plants evidence against Lucky. Maryanne breaks up with Lucky after confronting him about blackmail and Hub's killing.

Maryanne supports Hub and helps protect Cade by taking him to Nashville for safety; Kitty assists by planting evidence against Lucky; Cade is Maryanne's child, whose safety is a concern amid the demon threats.

The story features demons that possess humans, an earth demon named Erdos, a chained angel that escapes and is set to emerge at the Halloran Bail Bonds office, and ritualistic murders connected to these supernatural beings.