Many reviewers draw parallels to American Gods. So read those so I don't have to repeat them.

So this occurs in Moscow, and Russian gods and heads of myth do take part in the story. But what really irked me was how often I just lost the threads of what was going on. I had a hard time making sense of the story multiple times. Or I'd catch myself daydreaming, and then rewinding the audio so I could catch what just happened. Usually multiple times in the same spot.

And that thread of not understanding thankfully kept right up to the conclusion, so at the very least the book is consistently hard to follow.

I don't recommend this. Go read American Gods instead. Or a book of Russian myths.