Blue Heaven, by C.J. Box

2008 Edgar Award winner, this thriller set in North Idaho follows a 12 year old girl and her younger brother who go on the run after witnessing a brutal execution-style murder, and know that the killers saw them. Fun read, and really well done look at what happens when people (in this case retired LAPD) move into an area with well-established locals, and no one has the same ideas about what the town should feel like.