What book has a teenage girl and her brother who end up in witness protection program?

Kathy: What book has a teenage girl and her brother who end up in witness protection program?
Starts off a single mom with two kids, a teenage daughter and about eight year old son, they move to the city and by the end of the book the family ends up in witness protection program. I can’t remember why but I just recall it was a page turner! I read this book in the early ninety’s.

Answers and Views:

Answer by tiandron
Blue Heaven by CJ Box
“A twelve-year-old girl and her younger brother go on the run in the woods of North Idaho, pursued by four men they have just watched commit murder—-four men who know exactly who William and Annie are, and who know exactly where their desperate mother is waiting for news of her children’s fate. Retired cops from Los Angeles, the killers easily persuade the inexperienced sheriff to let them lead the search for the missing children.”