This book is like a ride that starts out rather slow and appears harmless enough until you realize, too late, that it is about really mess you up. I was reading along, enjoying the tour of London and the exposure to British terms that I had never heard before, admiring the detail of the forensics (I was thinking of calling this CSI London), getting into these interesting characters, trying to solve the clues and only getting it partially right---which I am sure is what the author intended, and then in the last 20% this thing got very dark and naaasty.
Suffice it to say that Hayder pulls no punches. No quarter is given and no one is safe.
I am most definitely hooked and already have the next two in the series loaded onto the Kindle.