Blood Hunt (A Breed Western #21). Breed, #21

Falsely accused of killing the son of wealthy rancher, the half-breed Azul, had set out across the sun-scorched prairie of West Texas with one aim: to hunt the real killers down and bring back; proof of their death. But what Breed didn't know was that his outlaw quarry were also being hunted by a blood-crazed Comanche shaman thirsting to avenge his father's murder, and that by robbing the shaman of his grisly prize he would commit a terrible crime against Indian justice - a crime that demanded payment in blood ...