Having enjoyed the first two books, this was a massive disappointment. So many threads left dangling, so much that was far too easy, so little explanation of what is going on.
Very little of the story makes sense. There's a weapon that can destroy FTL drives. Our heroes find it rather easily, even though the god-like Makers have been searching for it for millennia. And the weapon destroys 80% of the Emissaries' Fleet. Instantaneously. And rather wonderfully Trader provides Dakota with weapons and shields from a vanished civilisation that are much better than anything the Magi ships have and which mean she can invade Emissary space to launch the weapon. Oh, and the Emissaries can track Dakota through some technology that nobody thought to tell anybody about before. Planted by Hugh for reasons that are never given. And Trader has been on an expedition to the Greater Magellenic Cloud and found out how to work the weapon. But he didn't tell anybody. Deus ex machina indeed.
At the end, we still don't really understand the Makers or why they are leaving caches all over the place, we don't meet the Emissaries at all (except in battle) and so get no further with what they are about and there are hinted at links between the Makers and the Atn that never go anywhere. And the Magi? and the makers of the weapon? Who knows?
For good measure, there's some sort of nonsense about the weapon only working for the just or the not so bad or something that is never explained. And Lucas becomes really good at fighting and Dakota dies twice. But she's alive at the end again. Or something.
I don't really know what wrong here. Having set up great situation, Gibson seems to have completely run out of ideas as to how he's going to resolve it. Instead he pretty much rewrites the back story so as to provide solutions to all the problems he has created - oh, didn't I tell you that I have the control programme/brilliant weapons/tracking devices/location of Excalibur? He descends into sub-fantasy with his magic weapon that is only for the virtuous and chickens out of having his main characters die.
A real shame, as Nova War set up the conclusion so well. Two stars because if you have read the others, you have to read this one, otherwise on a stand-alone basis 0 or 1.