There was a lot of untapped potential in this book, and, from the afterword, I feel that the author's lack of interest and experience in the crime genre was a contributing factor. The main issue I had was that there were no real extraneous characters or red herrings, so every time a new plot point arose it was blindingly obvious who or what was responsible. Therefore, it became more and more dull as I worked my way through the 457 pages. As for the 'supernatural' element, it was rather underplayed- not a patch on Ben Aaronovitch.