The Slash K punchers slept soundly beside the chuck wagon. Suddenly—“lightning” flashed, “thunder” rolled and shrieking “rain” spattered the sleeping camp. But the lighting was the spurting flame from unseen rifles, the thunder was the crash of shots and the rain was a leaden rain of death! Again and again, the ruthless Mexican bandit, Pedro Cartina, and his raiders swooped won onto Lone Star soil and left a wake of robbery, arson and murder, until the Rio ran red with blood. Outnumbered 100 to 1, and with time running out on the men on the side of the law, Ranger Jim Hatfield plunged into savage pursuit of the border killers, to pit his guns and fists against the cruelest foe in Texas!