Sepulchre (1987)
Sepulchre by James Herbert

The bodyguard.

There is a house, hidden away in a small valley, that holds a dark and dreadful secret. The house is called Neath. There is a psychic who lives in that house who is part of its secret. His name is Kline. There is a guardian of the house, and of the psychic, and of the secret. He is known as The Keeper. Together, in unholy union, they serve a force whose existence threatens mankind itself.

But now a terrible danger is sensed and an outsider must protect them all. The outsider is Halloran, and he is unaware of the insidious evil he must face. He will learn of a multinational corporation's strange method of detecting new mineral resources; he will combat men who thrive on the worst of physical corruption; he will find love of a perverse nature; he will confront the darkness of his own soul.

And eventually Halloran will discover the horrific and awesome secret of the Sepulchre.

Quotes...

James Herbert “You gotta remember also that because I am an art director I envisage what’s gonna look good on the page. A title for me is a piece of artwork. The short titles you can have large or small and it still looks good.”

- James Herbert, from “Haunted by Rats” by Dave Hughes, Skeleton Crew II, 1988