Star in the Dust (1956)

"THE STORY OF THE MOST DESPERATE GAMBLE THE WEST HAS EVER KNOWN!"

The sheriff of Gunlock is planning to hang Sam Hall, who shot three farmers found on cattle land, at sundown. At the casino, betting is 8 to 3 he won't make it. The cattlemen are set to rescue Sam; the farmers hope to lynch him before he can be rescued; and Hall schemes for escape with his girl Nellie. But Sheriff Jorden is most concerned with finding out who hired Hall: a leading suspect is the sheriff's future brother-in-law.