Search - Deadspawn (Necroscope, Bk 5)

The whole Necroscope series kicks ass. You have to read the others before you hit this one though. It is worth it.

There's a maniacal murderer on the loose, brutally slaughtering young women with a ferocity that rivals that of the vampires Harry Keogh has spent his life combatting. The Necroscope's been asked to solve the crimes...asked by the dead spirits of the madman's victims.
Harry cannot turn downa request from the dead...even if it costs him his soul. In the climactic battle with the vampires, mankind prevailed and purged the vampires fromearth - thanks to Harry, his team of psychically-gifted spies, and Faethor Ferenczy, long-dead 'father' of the world's vampires, who betrayed his own kind.
But Harry's alliance with Faethor has a terrible cost - Harry's very humanity is under attack from the vampire evil coiled in his mind!

Harry Keogh is called on to stop brutal vampire slayings and forced to put his humanity on the line to do it.

This is the fifth part in Lumley's Necroscope series about a Necromancer named Harry Keogh and his war against the Vampires. Excellent read.

Great book. Number 5 of the Necroscope series.
(A little rough/readers copy.)