This is by far one of the best science-fiction stories I have ever read. In fact, if Scalzi does this well with novellas, all his books should be this length. At least all his books that have one very vital thing to say about our culture and our path forward.
I don't want to say much more about it. I fondly hope that those who are a) already sci-fi fans and b) haven't read it, will seek it out and devour it as I did. I will say three things, though. 1) it is not what it seems it will be 2) the subject matter takes a detour you are likely not to expect and 3) it is a thoughtful review of one of the deepest divides in our society and societies around the world.