Shadow series (Orson Scott Card)

The human race is at War with the "Buggers," an insect-like alien race. As Earth prepares to defend itself from total destruction at the hands of an inscrutable enemy, all focus is on the development of military geniuses who can fight such a war, and win. The long distances of interstellar space have given hope to the defenders of Earth--they have time to train these future commanders up from childhood, forging them into an irresistible force in the...

"Bestselling author Orson Scott Card brings to life a new chapter in the saga of Ender's Earth. Earth and its society have been changed irrevocably in the aftermath of Ender Wiggin's victory over the Formics. The unity forced upon the warrig nations by an alien enemy has shattered. Nations are rising again, seeking territory and influence, and most of all, seeking to control the skills and loyalty of the children from the Battle School. But one person...

Now that Bean and three of his children have fled to the stars they become cut off from Earth's scientists and are forgotten. But they are about to discover a derelict Formic colony ship on which they find the life support that is failing on their own ship, room to grow, and a mysterious, deadly disease that killed the ship's colony and may now kill them.