Desperate Souls by Gregory Lamberson
In this action-packed novel, Jake Helman--the ex-cop and zombie killer--has set up shop as a private investigator in lower Manhattan. When a woman hires Jake to prove that her dead grandson is dealing a deadly new drug called Black Magic on a Brooklyn street corner, Jake uncovers a plot by a vicious drug lord to use voodoo to seize the streets of New York City. Gun-wielding zombie assassins, hallucinations, and betrayal confront Jake at every corner, but voodoo creates more terror than zombies, and Jake finds himself poised on the edge of insanity as he fights to restore the soul of the one person he trusts. A combination of hard-core horror and hard-boiled crime fiction, this thriller is gripping and suspenseful.