Shadow Of The Giant: Book 4 of the Shadow Saga

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.