Original sin. Allison Brennan. 2011.

Haunted by chilling memories of demonic possession, Moira O’Donnell has spent seven years hunting down her mother, Fiona, whose command of black magic has granted her unprecedented control of the underworld. Now Moria’s search has led her to a small town that’s about to become hell on earth.

Tormented by his own terrifying past, ex-seminarian Rafe Cooper joins Moria’s dangerous quest. But Fiona is one devilish step ahead.Hungry for greater power, the sorceress is unleashing  upon the mortal world the living incarnations of the Seven Deadly Sins.