I actually finished this Sunday night, but I've been far behind so many other things that I didn't have time to post about it.
It has some of the same characters, places, and organizations that Halting State had, but it's an entirely different book. A lot of homicides happen all over the world within about two hours of each. Who could do that? There are lots of ideas (and lots of people who are worried) and when the inspectors interview people, the plot gets more and more convoluted. The ending is not entirely the end. A character that gradually becomes more involved is left ready to take over.
You need to read this carefully, even if you have to go back and read part again. I liked it a lot.