I'm going to start by telling you how AMAZING that cover is. It catches your eye immediately. Good job!
Now, the book. Even when you are given a big excerpt of the book, the author does a good job keeping everything a mystery, we don't get that much information and we are kept in the dark. I already have a few theories and I'm sure I'm picking this book when it comes out because I just WANT TO KNOW.
Great writing style, great characters, worldbuilding, and plot!