Spanish Gold (A Breed Western #14). Breed, #14

Billy Eagle had a problem. No-one loved a squaw man who had discovered a hoard of Inca treasure. And though Billy kept secret the location of his hidden cache, Cole Stanton wanted his gold. Wanted it badly, before he died of consumption. Billy was framed by Cole and his hands for a murder he didn't commit. Then Azul arrived on the scene. Breed, alias Azul, had scores to settle with any white man who crossed a fellow half-breed.
And together they laid a trail of blood and destruction that fired the scrubland...