Seventeen-year-old Leigh Mason is not sure she's ready to share her mom, her bedroom, and her little sisters with her new stepsister, Betsy. And she's definitely not ready to share her best friend, who happens to be a boy!

Coping with a blended family is not easy for either Leigh or Betsy, especially during their senior year in high school. Each step brings them nearer to a crisis that will either send them running in different directions or bind them firmly together (which, let's face it, would take a miracle).