When wealthy Wil Donvan's daughter and cowboy Yankton fall in love with each other, the young woman's classy European born mother wants to put a stop to the romance. 

A case of mistaken identity is no laughing matter for Festus when a U.S. marshal arrests the good-natured deputy as bloodthirsty murderer Frank Eaton. While Festus stands trial, Matt investigates to clear his friend's name.