Among the Enemy - Margaret Peterson Haddix

Matthias is an illegal third-born--a Shadow Child--living in a society that only allows two children per family. When Matthias encounters other third-borns, they ask him to join their campaign. Matthias must decide if he will risk his own life for the sake of others in the sixth title of this series. \n HIDE OR FIGHT? \n Matthias, an illegal third child, is caught in the cross fire between rebels and the Population Police. When he unwittingly saves a Population Police officer, Matthias is brought to Population Police headquarters to train as an officer himself. There he meets Nina, another third-born who enlists his help in a plot to undermine the Population Police. But Matthias is under constant scrutiny, and he has no idea whom he can trust. What can one boy do against a wicked bureaucracy?\n