Stone Cold - C. J. Box

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A stranger makes trouble for Wyoming game warden Joe Pickett in this gripping thriller in the #1 New York Times bestselling series.
Everything about the rich stranger is a mystery: the massive, isolated ranch in the remote Black Hills of Wyoming, the women who live with him, the secret philanthropies, the private airstrip, the sudden disappearances. And especially the persistent rumors that the man's wealth comes from killing people.
Joe Pickett, still officially a game warden but now mostly a troubleshooter for the governor, is assigned to find out the truth. But he finds out a lot more than he bargained for. There are two other men living up at that ranch. One is a stone-cold killer who takes an instant dislike to Joe. He doesn't frighten Joe at all. The other man is another story...