Raised in the African bush country by her zoologist parents, Cady Heron (Lindsay Lohan) thinks she knows about "survival of the fittest." But the law of the jungle takes on a whole new meaning when the home-schooled 15-year-old enters public high school for the first time and falls prey to the psychological warfare and unwritten social rules that teenage girls face today.
The Burn Book is a book created by Regina George and The Plastics to start rumors, stories, and gossip about all the girls (and several guys) who go to North Shore High School. Most of the members in The Plastics contributed to creating this book. The only girls who were not mentioned were Cady Heron, Gretchen Wieners, and Karen Smith, because they played a part in writing some of the pages in the book. After Regina found out the truth about the Kalteen Bars, she added herself to the book as a fugly slut to help prove she wasn't the one who wrote it.