Description: "Thrills, violence, time/space questions, and some contemplation about colonization make for action on the thoughtful side." -- Kirkus Reviews "With the same enthralling, cinematic pacing he used in Last Day on Mars, Emerson unspools nail-biting suspense. Through all the engrossing sci-fi action, however, Emerson keeps the plot solidly grounded in the characters, who are vivid and complex. A cliff-hanger ending promises deepening adventures in forthcoming volumes." -- ALA Booklist "[A] well-written and exciting sequel. Emerson, who has clearly done his research, uses humor and age-appropriate metaphors to present the science in a way that readers will be able to understand." -- School Library Journal

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