What happens when Ender, Tris, Petra, Four, Bonzo and hundreds of others go to the battle school, forced into politically built factions that make little to no sense given the situation? This is.
When Dan and Denis bring their army to a tiny planet 100 light years away from their homes, they are completely aware that everyone on board will never see their families again. However, more important than that is helping Jane alongside Nikolai Delphiki to defeat the firelord and stop him from using his bending abilities to overrun the hundred worlds.
The Battle School is reborn under direct instructions from the hegemon himself. Dan has to battle his way through all the teachers tests and above all else find out what made Peter Wiggin re-open the school.