So for a little bit, I have been reading Orson Scott Card’s Ender’s Shadow.  This book isn’t quite the sequel to Ender’s Game, however it is a look at the same situation just through a different view.  This novel follows the character Bean, from growing up on the streets of Europe.

Bean starts off as a very smart child, who is able to see the logic in things that is far beyond what his young years should allow him to see. After surviving for many he is discovered by the IAF, and after some testing gets sent to Battle School, and eventually he makes it onto Ender’s Dragon Army.

I can’t say I’ve ready books 3 and 4, and was unable to get into book 2 of the Ender’s series. However this one (its considered #5) is a very good read, and I doubt you would even to know anything about Ender’s Game to get this book, though it would probably help a lot.