Having met on a train, a smooth-talking psychotic socialite shares his theory on how two complete strangers can get away with murder to an amateur tennis player — a theory he plans to test out.
A police detective's violent nature keeps him from being a good cop.
Maria San Carlos, the only daughter of a wealthy landowner, is betrothed to Escobar, a General in the Mexican Revolution, but she does not love him. Escobar sends a mixed gang of Americans and Mexicans to capture her and bring her to him. Complications ensue when an American cowboy, who had been hitching a ride with Maria's entourage and has his gold stolen by the gang, pursues them across the desert.
