Watching the characters' friendships grow and seeing them let go of their cultural and class prejudice is beautiful too. I look forward to Tris's Book, Daja's Book and Briar's Book.
Pretty Town is divided into segments too, with the Party Towers in the city where the young New Pretties live, then suburbia where Middle and Late Pretties live with their families, raising their kids (or Littlies) until they turn 12 and are taken away as Uglies to live in the dorms for four years. Along the way, Tally loses a best friend to Pretty Town, then meets Shay, a girl who doesn't want to get the surgery to be a Pretty, and Tally's whole world changes... her adventures that follow are fast-paced, and a quick, fun YA read with a little mild romance between two of the 16+ characters at the end of the book. I found this book to be as compelling as The Hunger Games, without the darker story-line and gladiator/survivor themes. I'd say these books are good for kids 10 and up. The next three books in the series are: Pretties, Specials, and Extras.