On Lusitania itself, Ender attempts to find solutions to the looming catastrophes of the Congressional fleet, Descolada virus, and conflicts among the humans and intelligent alien species. Much on Lusitania centers around the Ribeira family, including Ender's wife Novinha and her children. Novinha and Elanora, the mother-daughter team responsible for most of the biological advances countering the complex Descolada virus, are unsure if they can manufacture a harmless replacement virus. Conflicts arise on whether they should even do so, since the Descolada is intrinsically tied in with the life cycles of all Lusitanian organisms and may even be sentient itself. In addition, to try to devise methods to escape the planet, Lusitania's leading, troublemaking physicist Grego is persuaded by Ender to research faster-than-light travel, despite Grego scoffing at the idea. The third "biologista" of the family, Quara, is convinced that the Descolada is an intelligent, self-aware species, and deserves attempts from the humans for communication and preservation. An additional sibling and Catholic priest, Quim (Father Estevão), is determined to use faith and theology to head off another form of xenocide: a group of warmongering Pequenino who wish to wipe out all Earthborn life via starship, carrying the deadly Descolada within them.