Once you've read "Ender's Game" you must go on. There are two paths to take. One is "Ender's Shadow" (which my daughter read next), and the other is "Speaker for the Dead"(which I read next). It's such a thought provoking world to get into. All the books in the series aren't equally good, but they're good enough to be worth the time to get the whole story.
"Ender's Game" was a must read in my opinion."Speaker" is a world of people and feelings that has stayed with me eventhough I read it 5 years ago.A great series.
After reading Ender's Game, this next book was a must. It can, however, stand on it's own quite well. You get enough of the previous story to understand the book, and it's very engrossing. It's nothing like the first book, which I find refreshing.
The author actually wrote Ender's Game (the novelization, not the short story) with this next book in mind, and it shows. As good as Ender's Game is (and it is VERY good, so if at all possible, start with THAT one), you can easily see the care Card put into the concept of Speaker for the Dead.
A great followup to Enders Game. While Enders Game introduces you to the characters and realities of the novels world, Speaker for the Dead introduces you to the true depth that Card is capable, and really fleshes out Ender and many other characters.
Orson Scott Card is a masterful writer, and this is an engaging story. It's a far more adult story than Ender's Game, and it's got a lot more philosophy than action. But there are tons of fantastic ideas, and the core mystery pulls you along to the end.
This book is very different from Ender's Game, but so much better in its own way. I never wanted this one to end. I thought this book was far better than Ender's Game (and I loved Ender's Game). But be prepared for a far different type of story.