The Last Aerie

Nestor and Nathan Kiklu are the twin sons of Harry Keogh, the Necroscope, the man who talked to the dead, rallying them to mankind's side for great battles against the vampires.
The twins, linked by blood and the unique mental powers they inherited from their father, are driven apart by their love for the same woman...and by their very different attitudes toward the vampires who prey upon their people.
Nathan takes up the struggle against the vampires, defending home and family, while Nestor, fascinated by the vampires' unearthly powers and eerie evil, has become his twin's worst nightmare: a vampire Lord!
Nathan is imprisoned by a megalomaniac ESPer who plans to invade the vampire world. Rescued by the members of E-Branch, the British psychic-powered spy organization once led by Harry Keogh, Nathan finds himself fighting side by side with his father's oldest friends.
Nathan Kiklu, like Harry Keogh, is a necroscope. He must win the friendship of the dead before he can return to his own world.
Nestor, growing ever more powerful among the vampire hierarchy, plots the ruination of all his enemies and the complete domination of the human race.
Harry Keogh's sons have become the bitterest of enemies, each determined to destroy the other. When next they meet, one will surely die!