Recently, however, I have come to realize that the 3,000-year gap between Ender's Game and its sequels leaves plenty of room for other sequels that are more closely tied to the original. In fact, in one sense Ender's Game has no sequels, for the other three books make one continuous story in themselves, while Ender's Game stands alone.

For a brief time I flirted seriously with the idea of opening up the Ender's Game universe to other writers, and went so far as to invite a writer whose work I greatly admire, Neal Shusterman, to consider working with me to create novels about Ender Wiggin's companions in Battle School. As we talked, it became clear that the most obvious character to begin with would be Bean, the child-soldier whom Ender treated as he had been treated by his adult teachers.

And then something else happened. The more we talked, the more jealous I became that Neal might be the one to write such a book, and not me. It finally dawned on me that, far from being finished with writing about "kids in space," as I cynically described the project, I actually had more to say, having actually learned something in the intervening dozen years since Ender's Game first appeared in 1985. And so, while still hoping that Neal and I can work together on something, I deftly swiped the project back.

I soon found that it's harder than it looks, to tell the same story twice, but differently. I was hindered by the fact that even though the viewpoint characters were different, the author was the same, with the same core beliefs about the world. I was helped by the fact that in the intervening years, I have learned a few things, and was able to bring different concerns and a deeper understanding to the project. Both books come from the same mind, but not the same; they draw on the same memories of childhood, but from a different perspective.