Shadow of the Giant by Orson Scott Card
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Bean's past was a battle just to survive. He first appeared on the streets of Rotterdam, a tiny child with a mind leagues beyond anyone else. He knew he could not survive through strength; he used his tactical genius to gain acceptance into a children's gang, and then to help make that gang a template for success for all the others. He civilized them, and lived to grow older. Then he was discovered by the recruiters for the Battle School. For Earth was at war - a terrible war with an inscrutable alien enemy. A war that humanity was near to losing. But the long distances of interstellar space has given hope to the defenders of Earth - they had time to train military geniuses up from childhood, forging them into an irresistible force in the high-orbital facility called the Battle School. That story is told in two books, Orson Scott Card's beloved classic Ender's Game, and its parallel, Ender's Shadow. Now, in Shadow of the Giant, Bean's story continues. Bean was the smallest student at the Battle School, but he became Ender Wiggins' right hand, Since then he has grown to be a power on Earth. He served the Hegemon as strategist and general in the terrible wars that followed Ender's defeat of the alien empire attacking Earth. Now he and his wife Petra yearn for a safe place to build a family - something he has never known - but there is nowhere on Earth that does not harbor his enemies - old enemies from the days in Ender's Jeesh, new enemies from the wars on Earth. To find security, Bean and Petra must once again follow in Ender's footsteps. They must leave Earth behind, in the control of the Hegemon, and look to the stars.