Maureen and Francine Carter are twins and best friends. But just before the girls start sixth grade, Francine becomes Fran -- a girl who wants to join the chorus, run for class president, and dress in fashionable outfits that set her apart from Maureen. Maureen and Francine are growing apart and there's nothing Maureen can do to stop it. Are sisters really forever? Or will middle school change things for good?