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True Blue begins with the marriage of black-sheep British nobleman Gilbert Brockhurst (Charles Clary) to the daughter of a Western rancher. When he learns that he has inherited his father's title and estate, Brockhurst deserts his wife (Frances McKeever) and young son Bob. Upon attaining adulthood, Bob (now played by William Farnum) becomes the boss of his grandfather's ranch. Outwardly a "hail fellow well met" type, Bob has never gotten over his father's desertion, and has sworn to get revenge on his "old man." Many reels pass before Bob and his dad are reconciled -- and when Bob is given a long-awaited opportunity to move to London to take charge of his ancestral estate, he chooses instead to remain with his friends and loved ones in the Wild West.