Defenders: A Sci-Fi Potential Apocalypse Story
I didn't read the back cover. Which isn't a crime, it just meant I initially thought this book was about the hopeless battle against the alien invaders, the Luyten. And it is. But there's also another story in there. The story which is obvious from the title.
It's sci-fi in the manner of Star Trek Next Generation: full of quandaries that tackle hard questions related to our humanity surrounded by technological innovations that spark curiosity and "what if's". If I had a sci-fi-loving book group, I'd read it and discuss it.
If you like John Ringo, give this one a try.
