by: Margaret Peterson Haddix
The main theme of this book is to always be yourself. Don't try to be someone your not. This theme is shown by the main character Bethany. She is a clone of her sister Elizabeth, and throughout the book, Bethany tries to act the exactly opposite of her, because she doesn't want to be known as her sister's clone. By the end of the book she realizes that trying to not act like her sister, makes her not act like herself. Finally she accepts the fact that they are similar and decides to be just the way she is.