In "Xenocide" by Orson Scott Card, the third book in the Ender's Game series, tension mounts as the planet Lusitania faces the dire threat of destruction by the Starways Congress. Ender Wiggin, along with his family and the indigenous Pequeninos, works to find a solution to the deadly Descolada virus that threatens both the alien species and the human colonists. Meanwhile, a brilliant young girl named Han Qing-jao on the distant world of Path uncovers secrets that could alter the fate of humanity. As complex moral dilemmas unfold, the protagonists grapple with themes of coexistence, free will, and the nature of intelligence, ultimately seeking peace across the universe.