Orson Scott Card is best known for the classic Ender's Game and other novels in the Ender universe. Also, his Tales of Alvin Maker is a great fantastic alternative history. Three books are in the Ender Saga and two are in The Tales of Alvin Maker. (1) Ender's Game; (2) Shadow of the Hegemon; (3) Children of the Mind; (4) Alvin Journeyman; (5) The Crystal City.