Necroscope

Jake Cutter is learning how to be a Necroscope - how to use the Mobius contiuum to travel instantaneously from place to place, how to talk to the dead - but the dead don't like him much. It seems Jake's got a hitchhiker in his mind, a dead vampire named Korath. Since Korath holds the key to the Mobius equations, Jake can't just kick him out ... though he's certainly trying!
Jake's not sure he really wants to be a member of E-Branch, the supersecret ESP-powered organization, that's dedicated to eradicating the vampire infestation of Earth. To Jake, the E-Branchers seem stuffy and hidebound - except for Liz, whom Jake wants to get to know better. But Liz is a telepath, and if Jake's not careful, she'll find out about Korath.
In Australia, Jake helped E-Branch destroy the aerie of the mind-master, Nephran Malinari, one of a trio of Great Vampires who came to Earth. Malinari escaped and went to ground with the hideously beautiful Lady Vavara.
Jake wants revenge against the Italian mobsters who killed the woman he loved and nearly killed him. As far as he's concerned, E-Branch can search for Malinari, Vavara, and the metamorphic Lord Szwart without him until he's satisfied his own bloodlust. But it seems vampire-hunting is truly Jake's job now - the men he's trying to kill aren't men at all, but vampire spawn, hidden for two generations in human guise! To defeat them, Jake will need every weapon in a Necroscope's arsenal, including the power to call the unsleeping dead out of their moldering graves.