Popularity is the best revenge. In the final weeks of eighth grade, Lauren Wood made a choice. She betrayed her best friend, Helen, in a manner so publicly humiliating that Helen had to move to a new town just to save face. Ditching Helen was worth it, though, because Lauren started high school as one of the It Girls--and now, at the start of her senior year, she's the cheerleading captain, the quarterback's girlfriend, and the undisputed...