Wait for Dark (Bishop/Special Crimes Unit 17) by Kay Hooper
In Clarity, North Carolina, the residents have fallen victim to an unfortunate series of events. Seemingly random accidents have taken the lives of several citizens in the small mountain town. But these deadly coincidences are anything but. Something is on the hunt in Clarity, and the only clue as to what is a cryptic note given to the victims 24 hours before they meet their ends: 'Wait for dark.' Sheriff Mal Gordon knows how to handle his town, but he has no idea how to handle this.