The Sundown Chaser (Thorndike Large Print Western Series)

As the new sheriff of Yellowstone County, Montana, ex-rancher Herschel Baker cleaned up the badlands with the weight of the law -- and a six-gun -- behind him. Now he's trying to solve a deadly puzzle that involves one lead-laden corpse, a large sum of money, and a loose end that points to cattle rustling. But his trouble hasn't even arrived yet. There's a border-hopping horse thief riding up from Mexico. His name is Thurman Baker. But Herschel calls him father.