In this science fiction story, people live in a small city inside some sort of enclosure they do not understand. All their light is artificial and most of their food and other supplies come from storerooms left by the mysterious “Builders”. The lighting system is breaking down and supplies are running out. Authorities deny the problems, so two teenagers try to solve the mystery.
This book would be suitable for youngsters as well as adults. I enjoyed it and read it quickly. DuPrau establishes her world quite well. I liked the main characters and wanted to see them succeed. Even though the ending sets the reader up for another book, it was satisfying enough as a stand-alone book.