Black Howl (Black Wings, #3)

Something is wrong with the souls of Chicago's dead. Ghosts are walking the streets, and Agent of Death Madeline Black's exasperating boss wants her to figure out why. And while work is bad enough, Maddy has a plethora of personal problems too. Now that Gabriel has been assigned as her thrall, their relationship has hit an impasse. At least her sleazy ex-fiance Nathaniel is out of the picture--or so she thinks...