Desperate for money, frontier rancher Van Heflin holds outlaw Glenn Ford at gunpoint, intending to collect the $200 reward. While both men await the train to Yuma that will escort Ford to prison, the cagey outlaw offers Heflin $10,000 if he'll set Ford free. The rest of the film is a sweat-inducing cat-and-mouse game between captive and captor, interrupted with bursts of violence from both Ford's gang (commandeered by Richard Jaeckel) and the vacillating townsfolk.