Spiritual hard sci-fi with zombies, vampires, and a little demon possession? That pretty much sums it up. Yeah. 
 This was less a sequel to Blindsight and more a story of similar events happening in the same world. The setting is mostly the same. The continuity kinda takes a back seat. Still, I enjoyed it. The author's voice is crazy unique, if nothing else. It is extremely highlightable. 
 I recommend to fans of the first book.