Jack Carstares, oldest son of the Earl Wyncham, disgraced six years earlier, returns home and becomes a highwayman so that he is able to live in the land he loves without detection. One day while out riding, he foils an abduction plot mastered by the infamous Duke of Andover. Injured while rescuing the damsel in distress, he is taken home by the thankful Diana Beauleigh and her Aunt Betty, to recover. Mystery and intrigue continue to the melodrama's end.