From Publishers Weekly

Set between Card's Hugo and Nebula–winning Ender's Game (1985) and Speaker for the Dead (1986), this philosophical novel covers familiar events, but puts new emphasis on their ethical ramifications. In the wake of his victory over the alien Formics, 12-year-old military genius Ender Wiggins is hailed as a hero, but governments opposed to the International Fleet, which trained him, intend to portray him as a monster. Ender winds up as titular governor of one of the new human colonies, where he struggles to adapt to civilian life and ponders his role in the deaths of thousands of humans and an entire alien species. His agonized musings aren't always sophisticated but possess a certain gravitas. Fans will find this offering illuminating, and it's also accessible to thoughtful readers new to the series. (Nov.)
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From School Library Journal

Adult/High School—Here is Card's answer to all those readers who asked, "What happened to Ender?" between Ender's Game (1985) and Speaker for the Dead (1986, both Tor), a gap that covers nearly 3000 years. Twelve-year-old Ender Wiggin should be coming home to a hero's welcome after wiping out the dreaded buggers—aliens who have twice defeated humanity in the past—in a fierce space battle. He is instead proclaimed a dangerous weapon and appointed titular governor of a colony world to keep him as far away from Earth as possible. His beloved sister Valentine joins him on the colony ship but is unable to penetrate the barriers he has erected around himself. Wracked with remorse at his genocide of the buggers, Ender searches for the reason the aliens allowed him to defeat them, knowing the answer will give him direction. As in most great speculative fiction, Card mines the depths of humanity's philosophical and political ideas through Ender's trials and discoveries. Exile brings together many drifting story lines from a number of other books in the series, so it's not for the uninitiated. For those who are familiar with Ender and his world, this is a wonderful treat to be devoured whole in a gulp and then returned to later to digest at leisure.—_Charli Osborne, Oxford Public Library, MI_
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