To save his family from disgrace, Capt. James Wynnegate takes the blame when his brother, Sir Henry, embezzles from a charitable fund. Relocating to America, James purchases a ranch in Wyoming and marries Nat-u-ritch, an indigenous woman. After the birth of the couple's son, James is startled by the arrival of Lady Diana, his brother's wife, who informs him that the nefarious Henry is dead.