«Cold Country» by Russell Rowland

Montana, 1968: The small town of Paradise Valley is ripped open when popular rancher and notorious bachelor Tom Butcher is found murdered one morning, beaten to death by a baseball bat. Suspicion among the tight-knit community immediately falls on the outsider, Carl Logan, who recently moved in with his family and his troubled son Roger. What Carl doesn't realize is that there are plenty of people in Paradise Valley who have reason to kill Tom Butcher.
Complications arise when the investigating officers discover that Tom Butcher had a secret—a secret he kept even from Junior Kirby, a lifelong rancher and Butcher’s best friend. As accusations fly and secrets are revealed one after another, the people of Paradise Valley learn how deeply Tom Butcher was embedded in their lives, and that they may not have known him at all.
With familiar mastery, Russell Rowland, the author of In Open Spaces and Fifty-Six Counties, returns to rural Montana to explore a small town torn apart by secrets and suspicions, and how the tenuous bonds of friendship struggle to hold against the differences that would sever us.