Tyler Killdeere, the last Killdeere not dead or in prison, is wounded and on the run when he sees a prisoner delivery going down in the streets of a small town. He's busily reminding himself that he must not attract attention, and besides it "ain't none of his business," when the pretty widow, Kate Courtland, runs out to shield her Uncle Tom, the marshal. A gunman points his rifle at her.
Now, Killdeeres, mean and deadly as they are, respect women. When the dust settles, the gunman is dead. Ty lowers his guns and Kate, who knows he is an outlaw on the run, thanks him. The judge, who doesn't know Ty, appoints him acting marshal until Tom is on his feet. The Bigbees aren't about to let the town hang the big man's son.
Ty may die here, on the streets from Bigbee guns, or with a rope around his neck if they tumble to who he is, but he's taken the job, and he'll play out the hand. Besides, he can't leave until Kate is safe.