Xenocide

On Lusitania, humans live alongside intelligent alien species while a lethal virus threatens human survival and is also essential to one of the local species. A starship fleet is on the way to destroy the planet, forcing Ender and those around him to search for a way to save everyone without triggering another xenocide.

At the same time, a second thread follows a distant colony shaped by rigid religious and cultural systems, where brilliant young people are drawn into a mystery tied to the larger crisis. The two storylines develop through debate, discovery, and increasingly urgent questions about life, intelligence, and responsibility.

As the pressure rises, family conflict, scientific inquiry, and philosophical argument become inseparable from the immediate danger. The story moves toward a difficult, highly speculative resolution that leaves major consequences and continuing questions for the next volume.