Phew this was a lot. This builds heavily on the first two books and I think the series keeps getting better. This is the history of the future world, which would look like paradise if we saw it, on the brink of war. How does a hyper interconnected world that has forgotten war, start a war?
I don't know what I can say without giving plot away. If you hated the previous ones, you'll hate this. If you enjoyed them, this one is that but better.