Dean Koontz - Dragon Tears

Synopsis:
Detective Harry Lyon is forced to kill someone in the line of duty one day and is later 
confronted by a man who predicts Harry's demise by nightfall. Soon after he and his partner, 
Connie Gulliver, are forced into a nightmare existence that destroys their relatively 
peaceful lives and must fight what must only be a bewildering evil entity in an insane world.