Carlos del Rio, a handsome young singer, works as a laborer on a road construction project near the Rio Grande in Texas. One night, a touring car and truck collide outside the camp and Carlos goes to their rescue. He finds the driver of the car, Pedro Medina, an elderly man who is taking his young granddaughter Lolita to Los Angeles to live with her older sister Teresa, seriously injured. When Pedro dies, Carlos, who has been notified that the will of his late uncle is being probated in Los Angeles, decides to take Lolita with him to California. There, Carlos rents a room in a boarding house and learns from his uncle's lawyer, Martinez, that, other than a cash settlement to Cruz Ramos, the owner of a gambling casino, Carlos has inherited the bulk of his uncle's estate. Martinez suggests that Carlos meet with Ramos, who has been named executor. At Ramos's apartment, Carlos meets Marta Cortez, a young singer who works as a cigarette girl at Ramos's gambling casino. Although Ramos informs Carlos that his uncle's estate consists of a retreat in the country that he has leased for $100 a month, in reality, Ramos has rented the property to a gambling syndicate for a huge amount of money. Through Tana, an actress in his boarding house, Carlos wins an audition at the casino where he again meets Marta, and the pair fall in love. When Ramos returns from a brief vacation, he becomes enraged upon learning that the proceeds from the gaming room and roulette wheel have declined. Meanwhile, through Marta and Tana, Carlos learns that Ramos has been cheating him out of his inheritance. In protest, they all quit Ramos' employ, and later discover that Marta is Lolita's long-lost sister Teresa. Soon after, the police raid the casino, and Ramos directs them to Carlos, who is arrested for owning an illegal gambling hall. Martinez testifies in Carlos's behalf, and Ramos is arrested and brought to justice. Carlos then reopens the casino on a legitimate basis and all ends happily.