Police Lt. Leonard Diamond vies to bring a clever, well connected, and sadistic gangster to justice all the while obsessing over the gangster's girlfriend.

The town's leading citizen becomes a homicidal maniac after his wife deserts him.

A street kid has dreams of becoming a jockey. He gets his chance when he and his gang discover a poor old man who has a championship race horse. The man agrees to let the boy ride his horse in a race, but first the gang must get enough money to pay for the race's entry fees.

At the request of the Mexican government, a federal agent and a lady reporter team up to catch a gang that has been smuggling gold from Mexico to the U.S. and then selling it to the U.S. government.