Book title: Damp Graves (Author:Wentworth M. Johnson)
Lost in the bowels of the earth, Bill and Newf find the unimaginable controlled by the unassailable – and hidden well enough to be almost undiscoverable. How could a house, a graveyard, a cave and a hospital all be so closely related? To save lives the puzzle has to be unravelled quickly. A fair maiden is being held firmly in the jaws of hell and Bill’s task is to rescue her, but he is outsmarted at every turn. He tries to match wits with an evil genius, only to discover he is playing right into the monster’s hands.