Deputy United States Marshal Spurr Morgan is set to retire -- bad ticker, he's learned -- but asks for one last assignment before leaving. What he thinks will be a routine assignment, turns out to be his most challenging yet: he must transport his old nemesis, Boomer Drago, back to Denver from the Medicine Bow Mountains. With Drago's gang on his trail, and a young girl needing his help out of the mountains, Spurr sets out to prove that even old wolves have a mean bite..