In the world of teenage girls, friends become enemies and enemies become friends on almost a daily basis. But ever so often there is a best friend who becomes a hated enemy through a series of unthinkable events. That is what happened to 13 year-old Monica Jackson when her closest friend destroyed Monica's life by embarrassing her on the Internet. Now her ex-best friend is queen of the school. So Monica must plot her revenge, avoid being embarrassed again, and hopefully get her period, all while trying to snag the cutest boy in school.