Newcomer Whitley crafts a dystopic novel that reads like fantasy rather than science fiction, refreshing in its classic approach. The completely self-contained city of Agora (the inhabitants believe nothing exists beyond the walls) runs on commerce. For every item or service there is an exchange; even death becomes a “life-theft” in this world. Founded on the zodiac and about to hit its 144th year, Agora stands poised for success or doom according to the secret Midnight Charter. In the midst of plots and counterplots stand two teens, who may have been foretold by the Charter and whose opposing experiences take center stage chapter by chapter: fierce, wonderful Lily, who believes in good for its own sake and founds a charity, and fame-obsessed Mark, whose meteoric rise makes him the darling of a city where reputation holds so much weight. Deft world-building and crafty plotting combine for a zinger of an ending that will leave readers poised for book two. Surprisingly sophisticated upper–middle-grade fare, with enough meat to satisfy older readers as well. (Fantasy. 11 & up)