The story concerns two agents, one Mexican (PJF) and one American, who are tasked to stop the smuggling of Mexican migrant workers across the border to California. The two agents go undercover, one as a poor migrant.

In turn-of-the-century New York, an Italian seeks vengeance on the mobsters who killed his father.

Recently paroled from prison, legendary burglar "Doc" Riedenschneider, with funding from Alonzo Emmerich, a crooked lawyer, gathers a small group of veteran criminals together in the Midwest for a big jewel heist.

A sportswriter forms a ring triangle with a fight manager's daughter and her Mexican-American boxer.

Enrico Caruso's only passion is to sing. For that, he leaves his hometown of Naples, Italy, and travels to America to sing for the Metropolitan Opera. At first, his lack of education and poor background make him an outcast in the high-class opera world. Eventually, his voice wins him both fans and the hand of his love, Dorothy. But his nonstop pace and desire to perform at any cost eventually take their toll on the singer's health.