Out of work cowpoke Bud Eugen comes across Marta, a mute sixteen-year-old Mexican girl whose family has been killed by Indians. Bud reluctantly takes her along, even though he's never had to accommodate another person in his simple life. He's unable to find anyone willing to take her. In spite of his prejudices, Bud grows to like the spunky girl (and her excellent cooking). Eventually, they both find work on a border ranch. Here, the relationship between the girl and the young cowboy hesitantly grows. But banditos raid the ranch, kidnapping the rancher's daughters and Marta. Bud, with twelve other men, pursue the banditos into the most desolate reaches of Mexico. Ambushes and battles with banditos, Rurales, and traitors are constant, and the brutal weather is as much a threat as the man-made perils. Life and death choices are made at every turn as one side gains the advantage, then the other. The rancher's daughters are rescued, and the exhausted party turns back. But Bud presses on alone, against insurmountable odds, determined to fulfill an unspoken promise to Marta.