Sara's Knight Wore a White Sailors Cap

Two cousins were raised by their grandparents. Margaret's parents died from an accident and Sara's parents died from the flu epidemic.
Sara was beautiful and always appeared happy and was kind to everyone. She had many friends and always had a good attitude about life. She inherited a large inheritance from her deceased parents and a marriage proposal from the most popular guy at school.
However, Margaret was always overweight and had a very negative attitude and felt that she would never get married, because no one ever asked her out on a date. She blamed Sara for all of her problems and bad luck. When she heard that Sara was engaged to the guy that she and half the girls at school had a crush on, she totally detested her cousin and refused to have anything to do with her.
The lives of both girls took a drastic change after they moved away from their grandparents' home.
Instead of having the storybook marriage that she had always dreamed of, Sara's home turned into a chamber of horrors.
Margaret felt that she was finally getting even with Sara when she began having an affair with her gorgeous husband.