If you're looking for a series that keeps you reading try the Ugly series by Scott Westerfield! The books in order go; Uglies, Pretties, Specials, Extras. It  all starts with a girl called Tally Youngblood, where she lives everyone is obseesed with being pretty. But you can only be turned Pretty once you are sixteen. When Tally finds out about  a place that everyone is ugly and doesn't care about thier looks will she decide to turn or will she join these mystery people.
Courtney