In a world where humanity lives in the sky to escape a deadly mist below, Cass dives into ruined cities, then is hired to find a way to eradicate the Mist.
Treasure hunts and zombies sail smoothly in the skies of this post-apocalyptic world, raising natural questions about why such horrors and miseries exist.
Connected by the past, but forced apart in the present, Noelle and Dante must discover the truth about the Firefly and Vestiges before they lose all hope—and each other—for good.