Ken posted about this on his blog, along with a link to the first chapter on the publisher’s site. I read the chapter and instantly ordered the book from my local bookshop. Finished it on New Year’s Day, so it counts as 2021.
He describes it as ‘the first volume of the Lightspeed Trilogy’, and adds that ‘the second volume is well underway.’ Which is fine, but I usually make it a rule not to start unfinished serieses. So not so much a rule as a preference, let’s say.
This particular book ends in a way that is satisfactorily complete, but open enough for the followups to go in all sorts of directions. Plenty of unanswered questions, but none so burning that the wait should be annoying.
It’s set in 2070, after that initial chapter which is three years earlier. Humanity is about to develop lightspeed travel. Or it already has. What intelligences will be waiting out there? Some people think the answer is ‘none’, because of the Fermi Paradox.
The political situation is interesting. The countries of the world have largely coalesced into three blocks: the Alliance, which is the Anglosphere minus Scotland and Ireland, but including India; the Union, which is most of Europe including Scotland and Ireland; and the Coordinated States, which is Russia and China. We don’t hear anything about Africa or the Middle East. There has been (or is ongoing) an event called the Cold Revolution.
Also artificial intelligences are commonplace, including androids that are essentially indistinguishable from humans.
And if you need to build a starship, obviously you’re going to add the FTL drive to a submarine. And where do you build such ships? On the Clyde, of course. A lot of this is set in places from my childhood, which is fun for me.