Necroscope by Brian Lumley

The book follows Harry Keogh, a man with the extraordinary ability to communicate with the dead, as he becomes embroiled in a battle against a powerful vampire named Boris Dragosani. Set against the backdrop of Cold War espionage, Harry's unique necromantic skills are sought after by both British and Soviet intelligence agencies. As Harry uncovers secrets from the deceased, he learns of Dragosani's sinister plans to unleash a reign of terror. The story weaves together elements of horror, supernatural abilities, and espionage, culminating in a thrilling confrontation between Harry and the vampire.