Brotherhood of the Gun — William W. Johnstone

Young Matt Bodine and Sam Two Wolves became blood brothers on the day the rancher's son saved the halfbreed's life, forging a bond no one could ever break. Beneath the Montana big sky, Matt learned the ways of the Cheyenne from his friend. And as years passed, a legend grew of the breed and the white man who rode together--and who could jerk killing iron with the best of them...

The blood brothers ride into the blistering heat and wind of the Arizona badlands. They're hard on a trail that leads deep into Apache territory toward the Mexican border, where a gang of desperados are running guns to the Apache and white-slaving kidnapped children. Along the way, Matt and Sam hook up with two companions: a prideful mountain man who lost his granddaughter in an Indian raid, and a young woman in search of her brother. Now, with outlaws ahead of them and warring Apaches on every side, it's time for some hard-case frontier justice along a trail blazed by bullets--and lined with bodies...