Citadel

This series keeps getting better.
We get plenty of action. There are space battles and ground conflicts using lots of cool futuristic weapons and equipment. Dirty dealing and do-or-die moments abound. Also, the special operative that showed up at the end of book two returns to make good on his promise. Things have seriously heated up.
The characters are well realized, especially the four POV characters. Their separate threads are starting to converge now. And, though his motivation remains unclear, I think I spotted the character who is trying to destabilize things and restart the war (of course that might be a red herring).
I would like a little more on how humans came to settle this system with its multiple habitable planets. (They don't seem to have FTL.) Perhaps we will learn more in a later book.
4+ stars