The Everlasting — Tim Lebbon

Thirty years ago, Scott's grandfather slaughtered his best friend, then committed suicide. Now the spirit of the murdered man has returned, seeking the ancient volume that can return him to life--forever.

Pursued by this savage spirit and accompanied by a strange woman who claims to be immortal, Scott must do the impossible. He must find the book that may have driven his grandfather to murder and destroy it before its secrets can be revealed.