The alliances built by the modern day island of Nantucket, transplanted into the Bronze Age 10 years earlier, must now stand against multiple enemies who may have poorer technology, but superior numbers and supplies, and with all the modern knowledge that has spread in the years since their arrival. And one of them, of course, is Greece, lead by one from their own time who went rogue and decided to conquer.
As the third book in a trilogy, this one is pretty much designed to wrap up the major ongoing threats. Unfortunately, for me, that means that it's largely filled with the kind of thing that interests me least about the series, long descriptions of battles. There's still some good stuff in between that for me, negotiations for peace, elements of playing around with technology and resources, and even some character work, but there's not enough of it to enjoy quite as much as I did the second book.
I do like, mostly, how the threats were dealt with, even if some of them seemed anticlimactic (and last minute new threats in the closing pages of the book did make their resolution feel extremely rushed), and I think the author did some work making some of the more antagonistic characters a bit more fleshed out... if only, in some cases, by making it clear that, as evil as they were, they were often strategically generous to the point where the people who support them thought they were wise, benevolent kings and that they were in the right side of the war.
Moreover, once again upon reading this, even with the parts I didn't care as much for, I find myself wishing that he continued this series (rather than the, in my opinion, far less interesting Emberverse, set in the world Nantucket left behind where technology stops working). I want to see how this world develops ten, twenty years on, and catch up with some of the characters again. The book does set up for more adventures, but as far I know there's never been any. So, I guess that means I enjoy it enough to give it three stars.