I just finished reading Ender’s Game by Orson Scott Card. Great book and a fast read, I highly recommend it.
The story is about a young boy who has the greatest mind of any human alive, perhaps in history. Napoleon, Alexander the Great and Julius Caesar rolled up into one; except without their failings. Mankind had been attacked by an alien species that tried to colonize our planet twice and the boy is supposed to be the only hope for man to survive a true invasion. The book is extraordinarily well-written and the plot moves along at a brisk pace with lots of little interesting tidbits from the world created by Orson Scott Card.