Scott Westerfeld dedicated "Extras," "To everyone who wrote to me to reveal the secret definition of the word 'trilogy.'" A book written at the demand of Westerfeld's teen audience, "Extras" takes place three years after we last left Tally Youngblood in "Specials" - when she ended the pretty-time and headed out into the wild. Now the story focuses on fifteen-year-old Aya Fuse, an ugly living in a post-mind-rain Japan under a reputation economy where fame is everything.
Though "Extras" takes off from the "Uglies," "Pretties," and "Specials" trilogy, using the same lingo and featuring appearances by previous characters, because it focuses on a new cast of characters in a new city, and because Westerfeld blends in sufficient backstory, the fourth book can stand on its own. As always, Westerfeld's action and pacing is terrific. It's hard to put down a book when every chapter ends on a cliffhanger!