C. J. Box

A twelve-year-old girl and her younger brother are on the run in the Idaho woods, pursued by four men they have just watched commit murder four men who know exactly who William and Annie are. And where their mother lives. Retired policemen from Los Angeles, the killers easily persuade the local sheriff to let them lead the search for the missing children. Now there's nowhere left for William and Annie to hide and no one they can trust. Until they...