Earth Awakens - Orson Scott Card, Aaron Johnston

It is one hundred years before the events of Ender's Game. Tens of millions are dead in China as the invading Formics scour the landscape and gas cities with a lethal alien chemical. Young Mazer Rackham and the Mobile Operations Police scramble to find a counteragent, while asteroid miner Victor Delgado infiltrates the alien ship in near-Earth orbit. Victor needs to find a way to seize the ship and end the war, but he'll need a small strike force of highly skilled soldiers to pull it off. In this last-ditch effort to save what's left of humanity, Mazer Rackham and his team may be just the men for the job...