C.J. Box 
Badlands [EPUB ebook] 

Investigator Cassie Dewell is thrust into the middle of a gang war in the crime series that inspired Big Sky.Can one woman tame them?30 below zero, but Grimstad like hell hasn’t frozen over. The middle-of-nowhere town has struck oil. As oil flows out, men and money flow in. And with them comes organized crime.Cassie Dewell, Grimstad’s newly appointed deputy sheriff, has been thrust into the middle of a brutal gang war that’s leaving bodies scattered across town.Cassie knows she’s in over her head. But one witness keeps turning up at her crime scenes: a 12-year-old boy with a knack for being in the wrong place at the wrong time.And he might just be the key to her survival.