When professional gambler Jimmy 'the Kid' Casey beats the son of wealthy ranch owner Jack Hartigan in a game of poker, he is forced to shoot the young man dead in self-defence. Hartigan vows revenge and the card player flees the town of Paradise, only to find himself pursued by a gang of killers led by Abe Morgan. Things become more complicated when the gang captures Jimmy's fiancee, and renegade Apaches go on the warpath ...