I enjoyed the book but there was kind of a problem with the end that i don’t remember if they resolved.
I seem to recall that the substance that stabilized the “gone away” world was acquired in such a morally repulsive way that the hero and company sabotaged its production. Which means that they were going to have to live with the effects of the gone away world, which is quite frankly eventually fatal. I’m not sure I understand how things were expected to work out at the end there.