Although fond of childhood playmate Marcelle Riley, Luke Halliday, whose father made his fortune as an Arizona miner, becomes engaged to Eleanor Steele, a New York society belle. When Scar Norton arrives from Arizona and discloses that Luke's mother was an Indian, Luke is so traumatized that he breaks his engagement and ventures West to live among his mother's people. About to marry the Indian maiden Mo-Wa, Luke discovers that he cannot go through with the ceremony and retreats to the Settlement of Lost Hope, where he again encounters Scar Norton. Enraged when Scar taunts him over being a half-breed, Luke is about to kill his accuser when Marcelle and her father arrive and prevent him from committing the crime. Returning home with the Rileys, Luke finally realizes that Marcelle's pure love transcends all boundaries of race.—AFI