You'll love 'Ender's Game'! And don't miss the sequels. The style of the novels is very different, but they're good anyway. And, while you're at it, I'd recommend you to read 'Ender's Shadow' directly after 'Ender's Game'. It explains a lot of what's going on behind the scenes.

The only known quantity that moves faster than
light is the office grapevine. (from Nan's fabulous Home series)