Cowboy Jack Carter, the proud owner of the Australian shepherd Bunk, accepts the challenge of corralling 10,000 wild horses within a 10-day period. With the enormous sum for his efforts, Jack prepares to propose to Jessie Hayden. Unfortunately, Jack's rival, Charlie Champion, seeks to stop him from achieving both of his goals.

Notorious liar Windy Watkins is pursued by Marshal Flynn when he tells a story about mining in Northwest Canada and the murder of his partner.

Parolee Bart Tullison becomes foreman of Anita Stillwell's ranch near the Nevada border. While Anita considers Bart a coward because he will not pursue cattle rustlers across the border, Jefferson Bradshaw learns of Bart's past and resolves to use it to end the growing affection between Anita and Bart.