The writing style takes a while to get used to; it's very chatty and it took >50 pg before anything happened (finding dragons) and the story finally took off. It took me a bit longer to get used to the style.
It is information dense and the print is small so it took longer to finish this. I did like the story.
Well worth sticking with it. The premise and the putative science behind it (a lot of which is worked out as the story develops) work.