Orson Scott Card
1) Ender's game
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English
Description
Once again, Earth is under attack. An alien species is poised for a final assault. The survival of humanity depends on a military genius who can defeat the aliens. But who? Ender Wiggin. Brilliant. Ruthless. Cunning. A tactical and strategic master. And a child. Recruited for military training by the world government, Ender's childhood ends the moment he enters his new home: Battle School. Among the elite recruits Ender proves himself to be a genius...
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Description
Ender Wiggin's adopted world of Lusitania, with its three sentient species and his oldest friend Jane, a computer intelligence, are threatened by a fleet of ships sent by the Starways Congress, but with the help of two new beings created by Ender's mind, the planet may still be saved.
3) Xenocide
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English
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Description
Lusitania seems to be a planet on which three intelligent species--humans, the pequininos, and the Hive Queen--can finally live together, until a virus dangerous to humans but vital to the pequininos is found, and the Starways Congress orders Lusitania and its inhabitants to be destroyed.