After her mother's death, Mary not only becomes the household slave of her overbearing father, Scottish American Andy MacTavish but also becomes a mother to her little sister Ruth at their home on the Dakota plains.

Priscilla Worth, an innocent country girl, goes to the city to visit her aunt, who has sent for her, thinking that her childlike simplicity will afford a welcome relief to Vincent Morgan, a wealthy bachelor and man-about-town. The plan works, but soon after Vincent and Priscilla's marriage, Vincent, besieged by his friends to return to his gay life and suspicious of his wife's relationship with Durant--an artist who has painted her portrait--yields to temptation.