The Witching — Chet Hagan

The old man had been brutally murdered. That much was clear. But when Sheriff Stauffer began his straightforward, by-the-book investigation, he never imagined that the case would lead into the strange and twisting byways of the supernatural. Murder follows murder, until terror engulfs the picturesque Pennsylvania Dutch countryside. Shock by shock, the nightmare practices of Hexerei come to light, still wielding their ancient powers of death and destruction.