The Ruling Passion: Tony Valero, a lusty young vaquero, is enamored of Clarita Montes, whose father is fairly well off, as the middle class Mexicans figure. Clarita prefers Tony to her numerous admirers, but the father has selected, for his future son-in-law, a young dandy called Jose Rodreguis, who has a certain amount of money which allows him more ease than his neighbors. Jose trades upon this fact and presses his attentions upon Clarita. He bitterly resents her preference for Tony and does all in his power to belittle his rival.