An Ice Cold Grave by Charlaine Harris (Harper Connelly Book 3)

Harper Connelly was struck by lightning as a teenager, and now she can find the dead.

In her third case, Harper and Tolliver, her stepbrother, are hired to find a missing grandson. But the truth is far worse than a single dead child, for numerous teenage boys, all unlikely runaways, have disappeared from Doraville, North Carolina. Harper soon finds the eight bodies, buried in the half-frozen ground, but then, still reeling from coming into contact with her first serial killer, she is attacked and injured.

Now she and Tolliver have no choice but to stay in Doraville while she recovers, and as she reluctantly becomes part of the investigation, she learns more than she cares to about the dark mysteries and long-hidden secrets of the town: knowledge that makes her the most likely person to be next to end up in an ice-cold grave.