According to the Pattern
Author: first_name: Grace Livingston
last_name: Hill
Language: English
Year: 1903

Miriam Winthrop doesn't know what to do when she realizes her beloved husband Claude, the father of her children, has become infatuated with another woman. Her marriage vows were made to be kept, and not just as empty words that now echo from room to room in her lonely home. Is there a way for love to triumph? Miriam determines to fight for him, and she will fight fire with fire! - Summary by LikeManyWaters