The Parent Trap meets Mean Girls when two girls are forced to spend summer vacation together in the same small house--because their parents are dating. Charlotte and Lily are not friends. And they do not want to become sisters. Charlotte is the queen bee of her eighth grade class--popular, confident, always wearing the trendiest clothes--and judging others for what they wear. Lily is a loner who dreams of becoming a writer--and she wants nothing to do with Charlotte and her snobby crowd. Then Charlotte's divorced father starts dating Lily's single mother. Neither one of the girls even notices--until the day they learn that they are going on vacation together. Worse than that, they'll have to share a small bedroom for two whole weeks.

Charlotte plans to freeze Lily out, and Lily thinks she'll ignore Charlotte, but between Lily's fear of getting Charlotte for a sister, Charlotte's plans to reunite her parents, and their parents forcing quality time on them, things start going from bad to worse. Can two girls ever make peace, or will they drag their vacations--and their parents' romance--into disaster? Every teen girl's worst nightmare becomes an entertaining, surprising and heartfelt story in the hands of seasoned middle grade pro Marilyn Kaye.