I'm actually going to refrain from writing much of anything about this novel.
It just simply didn't take for me. When I was approved by Grove Atlantic to be an early reader of this novel, I was aware that the modern sections of this story are set in an "alternate present" Russia, which made me slightly nervous, but the further promises of Russian folklore and brotherly love made me certain I would like the story.
I didn't dislike it, but I also just stopped reading. It simply didn't compel me to continue. I do feel like if you're fond of alternate realities and dystopian stories (but also mixed with real political and folklore histories), you may very well appreciate The Great Glass Sea.