From School Library Journal
Grade 4–9—A solid and satisfying conclusion to the "Ember Saga," set in a post-disaster future. Hostilities have died down between the citizens of Sparks and the refugees from the underground city of Ember, and all are working together to survive the brutal winter. A roamer brings forth the barest remains of a book that intrigues Doon and Lina because it alludes to a mysterious device that may still be in Ember. They decide to go back to see if they can find any answers or, if nothing else, food. What they find is the Trogg Family, travelers who have taken over the remains of the city, scavenging supplies and making grand plans. Doon is caught and shackled, leaving Lina to try and make her way back to Sparks to get help. Once again, the teens, both remarkably self-sufficient and imaginative, are able to save themselves and figure out at least a small part of the mystery left behind by the Builders. In doing so, they help their community and ultimately the entire planet. And the epilogue gives the answer to a question raised in the series' prequel, The Prophet of Yonwood
(Random, 2006), namely, what Hoyt McCoy was up to with that telescope of his. All the loose ends are tied up neatly and everything ends on a positive, hopeful note. Satisfying, indeed.—Mara Alpert, Los Angeles Public Library
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"An electric debut. Lina and Doon’ search parallels the universal adolescent quest for answers.”—Publishers Weekly,