Heretics (Nel Bently Books, #4)

Without Earth, Nel has nowhere to run.

Hot-tempered Dr. Nel Bently is not cut out to save the world. After her last project ended in fire and death, Nel must put aside her distrust of just about everyone and embark on a lo-fi search for a deadly radio transmission.

Earth's survivors are torn between the austere superpower of IDH and the high-tech grassroots Los Pobledores. At every turn more allies go missing and Nel questions where everyone's true loyalties lie--and on which side Lin will ...