John Hardy, a ranch owner, marries Cleo Dade, not realizing she belongs to a gang planning to use the ranch as headquarters for Mock Sing's opium smuggling operations. When Hardy suddenly disappears, Cleo takes charge of the ranch, usurping the place of Hardy's daughter, Rose. Suspecting her father is still alive, Rose visits Mock Sing's cabin. John Smith, a card dealer for Mock Sing who is attracted to Rose, saves her from Mock Sing's assault and frees Hardy, who has been held prisoner. Soon after, Hardy's ranch hands attack and kill Mock Sing, Cleo is revealed as the wife of gang member "Square Deal" Dixon, and the ranch is restored to Hardy. John Smith, actually a government agent sent to curb opium trafficking on the border, marries Rose.