This one starts much slower and gives us basically two places in space plus people we know from earlier books. Khouri lands on the refugee planet and asks them to help her find her daughter, Aura, because Aura knows what's going to happen. On the moon, some years later, a 17-year-old girl is trying to get to the head of the moon who makes people have viruses that give them religion.
The wolf (Inhibitors)/human & conjoiner battle has reached the refugee planet and the original lighthugger takes as many people off as they can and runs while the conjoiners block the wolves. The lighthugger eventually reaches the moon and in order to find something about the planet it orbits (and pick up Aura), they agree to defend the moon. The head of the moon cheats them.
This ends without a real resolution -- we don't even know if our characters, some from all three books, survive -- and I didn't like that. I like knowing more about what happens with the wolves, conjoiners, and humans, but I'd like to have a solid ending.
Next, the Asimov's that arrived yesterday, and then the two Reynolds books that are in this universe, but not part of the semi-series.