Carly Merrin is determined to make this a birthday to remember. After all, she's finally going to be a teenager! But even a super sweet thirteen can turn sour. Favor mix-ups, feuding friends, and missing guests are only the beginning of Carly's party problems. Her thirteenth birthday will be memorable --- for all the wrong reasons! The biggest bash of Carly's life is about to turn into the biggest mess of the year. . . .