The Preacher discovered when he decided to ride herd on the last of the lawless O'Terrans! 

...But a stranger finally did come into town after dusk the third day. He was tall, young, slim, knew how to ride a horse and wore his six-gun in a knowing manner. His jaw looked lean and tough, and his...

...And the night breeze sighing down from the peaks seemed to carry the mocking laughter of Wild Bill Leatherby to him. It was like the death knell of a lifetime’s hopes. He had tried to mould Bert Freeman...

One by one Martin shot down the men who had killed his wife—till there was but one, a mere boy, left to kill 

That cave held a murdered man and a dead horse—but it also held the secret that led to a hang-rope payoff for a bushwhacker