Out of Range — C.J. Box

A good friend and fellow game warden has killed himself, and Joe Pickett's been chosen to temporarily run his district. But Jackson, Wyoming, is a far cry from Joe's hometown of Saddlestring--and it doesn't help that now Joe feels compelled to investigate the circumstances surrounding his friend's suicide. But as he comes closer to the truth, the more his own life spirals out of control--and he realizes that if he isn't careful, he may be Jackson's next victim...