The cruel Mexican General, Jamarillo -- the one they called the Scorpion -- had been assassinated, and the four young Mexicans believed to have done the deed were led by an American known only as Amigo. But who was this mystery man? Shawn Starbuck had reason to believe it might well be his missing brother Ben, last known to be using the name of Damon Friend. Since "amigo" translates to friend, it was a distinct possibility. But the trail leading to Amigo was treacherous and would lead Starbuck to the Mexican border near El Paso, north to the Rio Grande Valley and the mountains of New Mexico, and on to Dodge City. More than one man would die before the mystery man "Amigo" would be revealed.