Firebrand Trevison owns the Diamond K Ranch, which the railroad is anxious to acquire. To execute the purchase, Rosalind Benham, the railroad president's daughter, her aunt and Benham's representative Jefferson Corrigan, who is in love with Rosalind, travel to Arizona. Corrigan and Firebrand take an instant dislike to each other, and a fistfight develops between the two men. When Firebrand becomes friendly with Rosalind, Corrigan determines to ruin his rival. He conspires with a crooked judge to challenge Firebrand's title to the ranch and attempts to subvert the rancher's budding relationship with Rosalind by inducing Hester Keys to pretend that she is involved with him. After a series of misadventures, Firebrand surmounts these challenges to retain both his land and Rosalind.