Deputy Marshal Mason Barker is worn out. Money's sparse, his son's a bum, and his back is giving out after years in the saddle. He's too old to chase down owlhoots, especially the gang of bandidos terrorizing the New Mexico Territory led by the ruthless Sonora Kid. But Barker has a noose that's the perfect fit for the Sonora Kid's grimy neck. Maybe then he'll get some peace.