Minor member of a Boston law firm, Donald Joseph Blenhorn goes to Mexico to investigate Dorothy Charlton's fiancé, Hugh Hankins, who must meet approval of the firm representing her father's will. Blenhorn appears in Mexico disguised as rancher Don Jose, a Mexican aristocrat, and discovers that Hankins is a cad and coward. Blenhorn becomes embroiled in a fight with Juan Lopez who attempts to kill him but mistakenly kills the village storekeeper instead. Lopez places the blame for the murder on Blenhorn, and a mob of Mexicans attack Blenhorn's ranch. Blenhorn escapes, establishes his own identity, exposes Hankins' true character, and wins Dorothy's love.—Pamela Short