Orson Scott Card has written in almost as many genres as Isaac Asimov! And he has one advantage over dear Asimov--He thinks in the same manner as the top authority of each genre. Read his horror and you will "hear" a bit of Steven King amongst a great deal of Card. Read his historical novels (emphasis on historical) and you'd swear you'd been there. His religious novels keep you riveted even if you aren't Mormon.

Ender's Game is his jewel. Four books that among them have won innumerable awards. These are not books which have crossed genre, these are books that cause other genres to lose readers.

This film is in development right now, with Wolfgang Petersen (Air Force One, Troy, Poseidon) directing. I read Ender's Game in grade school, but it might be worth rereading if you're a sci-fi fan.