They Came to Riba — John Dyson

JayCee Lanchester, the richest rancher in Arizona's Tonto Basin, runs the town of Riba, keeping his daughter Margarita a virtual prisoner. But Margarita's chance meeting with Welsh-Texan Cal Jones spells love at first sight, and a bitter cordial for her father. Not only is Jones a sheepman, but he has flouted rules to bring his drought-thirsty flock down to the waterhole in the basin. Soon the whole valley is feuding and fighting. To make matters worse, evil Jake Houck and his gang arrive to hunt down Jones...