Alors que les constructeurs de chemins de fer traversent sans relâche le désert de l'Arizona en direction de la mer, Jill arrive dans la petite ville de Flagstone avec l'intention de commencer une nouvelle vie.

Two men, Philip Whittemore (Henry B. Walthall) and Thorpe (Harry Northrup) both go to the Northwest to gain the right-of-way for their railroad company from D'Arcambal (Emmett King). Whittemore arrives first and D'Arcambal refuses to meet with him until he saves his daughter, Jeanne (Pauline Starke) from going over the rapids. Then Thorpe arrives and tries to use force by kidnapping Jeanne and insisting that he is her father.