Good, not great.
I got my copy with Amazon First Reads for January. 
While reading this one, I enjoyed it. The suspense of it all, the possible twists, but when all was said and done, it kind of fell flat for me. I think I wrote a better twist ending in my head, honestly, so as it all came together, I was left disappointed.
Characters were unlikable, side stories of mythical creatures were unnecessary, and overall, I'm not sure it was believable.