Festus returns to Dodge from wolfing and is hired by the Cattleman's Association to hunt down the wolves killing everyone's cattle. What he finds is that what's been doing the preying may wind him up in prison if he doesn't get Matt's help

Bucko, a close friend of Festus, is accused of murdering a man to whom he lost at poker. When his alibi witness lies out of fear, Bucko is sentenced to hang, and Festus, who'd begun to see the marshal as a friend, vows Bucko won't swing.