Tangled Trails: A Western, Mystery/Detective Classic By William MacLeod Raine! AAA+++

Excerpt:

Cunningham had always led a life of intelligent selfishness. He had usually got what he wanted because he was strong enough to take it. No scrupulous nicety of means had ever deterred him. Nor ever would. He played his own hand with a cynical disregard of the rights of others. It was this that had made him what he was, a man who bulked large in the sight of the city and state. Long ago he had made up his mind that altruism was weakness.

He went through his mail with a swift, trained eye. One of the letters he laid aside and glanced at a second time. It brought a grim, hard smile to his lips. A paragraph read:

There's no water in your ditch and our crops are burning up. Your whole irrigation system in Dry Valley is a fake. You knew it, but we didn't. You've skinned us out of all we had, you damned bloodsucker. If you ever come up here we'll dry-gulch you, sure.