Slocum and the Diamond City Affair — Jake Logan

BREED TO DEATH
Slocum has just ridden into Diamond City, but with hardly a chance to clean his whistle, a man approaches him with a job. Casey O'Riley lost two rare-breed racehorses -- and his wife -- to a couple no-good outlaws. He'll pay top dollar to get the horses back. For his wife, he'll do just about anything.

Now, Slocum's on the trail with O'Riley and a lovely señorita named Rosa along for the ride. And despite several days' head start, the no-good horse thieves find themselves neck and neck with the last man they'd ever want to cross.