Guns on the border
(Book)

Arizona Ranger Sam Burrack is in the Mexican badlands, working his way down a list of killers, rapists, and desperadoes who thought they could escape the law. When Burrack's list of prey leads him to the remote town of Esperanza, he uncovers a hive of American mercenaries in cahoots with corrupt local federales. Led by vicious Desmond Prew, they've been hitting U.S. Army supply trains just over the border, stealing weapons and ordnance. But now they've set their sights on a prize that could destroy the country of Mexico. And it's up to Burrack, aided by a brash young Secret Service agent, to stop Prew cold.