This third part of the trilogy is interesting. The science did make a bit more sense in this one. The sickness from being in Dormance and under the influence of lethargum made sense. Of course there's a physical consequence for being in a forced comatose state for over a decade. I enjoyed the riddle/scavenger hunt part of the novel.
What frustrated me was the hypocrisy of using the sanare on just the main character and her family and friends, but then stating, unequivocally, that it would be immoral for anyone else who was suffering from the after effects of Dormance to use it. The greedy pharma aspect was vague and a bit obtuse, and then the idea that, even before any real distribution of the sanare, that Mother Nature would suddenly unleash Hell? If this were more fantasy than sci-fi, with Greek-influenced gods who watch over humans and become jealous and angry, then that would make sense. If it had been better presented that the crazy climate was based on the strain that sudden reappearance of half the human population put on the environment, then that would have made more sense.