Bare Bones by Kathy Reichs

"Down Time" is not a phrase in Tempe Brennan's vocabulary.  A string of disturbing cases has put her vacation plans on hold; instead, she heads to the lab to analyze charred remains from a suspicious fire, and a mysterious black residue from a small plane crash.  But most troubling of all are the bones.... Tempe's daughter's new boyfriend invites them to a picnic-a pig pickin' - in the North Carolina countryside, where a cache of bones turns up.  But are they animal or human? X-rays and DNA may link the crimes, but they can't reveal who is closing in on Tempe and her daughter - and how far they will go to keep her from uncovering the truth.