This is a sublimely written mystery novel with an elaborate and intricate plot. Unlike most of the genre it doesn't have a big reveal where it all comes together, rather it all just gradually unfolds and secrets are revealed throughout. The pace does increase towards the end and the zodiac calendar chapter structure does help convey this. 

The astrology used in the chapter headings and the larger sections is quite a nice idea, and I'm aware if you study what it's supposed to mean it can add an extra dimension to the book. I can't bring myself to read anything about astrology though... it's just such ****. The mostly subtle but occasional blatant astrology in the plot itself felt a bit odd given the world was so real except for those points, and broke the realism a little for me, the mental link between 2 characters did feel like an unnecessary addition.

Overall it's a great book, and my dislike of astrology didn't actually spoil my enjoyment of it much at all. The structure and writing is very much my style and it's worth the long investment to read.