A Woman's Fool (1918)

Cowboy Lin McLean's restlessness takes him to Denver, where he becomes enamored of a waitress named Katie. Intending to marry her, Lin accompanies Katie back to the ranch, but a traveling rainmaker arrives in the little town, and Katie departs with him after revealing that he is her husband. Visiting Denver for Christmas, Lin adopts Katie's abandoned son Billy, and soon afterwards, the cowboy meets and falls in love with the new station agent, Jessamine "Jessie" Buckner. Lin and Jessie marry, and the little family is happy until Katie, determined to be rid of her neglectful husband and marry Lin instead, appears and drives Jessie away. Realizing that Lin does not love her, Katie poisons herself, and Jessie returns to Lin and Billy.