“What alters wanting is what’s behind it. Greed and hope aren’t opposites. Greed and hope are twins grabbing for the same thing, one in fear and one in faith.” 

I am putting that quote at the top, just because I loved it so much. It stopped me cold. Read and reread. Caffall's writing is so profound throughout this adventure story. Another example: Instead of telling us a character is tired, she says the character "barely felt her sleep." Just little moments like that are so engaging.

Also engaging: It's an extremely fast-paced adventure story!  

There are lots of comparisons to Station Eleven with this novel, and they're apt. Whereas Station Eleven though was about art making us human, this is about preserving the science that can remind us what the World As It Was was like, and could be again. Either way, preserving what made us human is what gives us hope. And the main similarity is that a small but determined band of humans endeavor to keep that hope alive.