You should start this book only when you have time enough to read it. Once I had started, I wasn't able to put it down.
There are several stories going on on different levels. An investigation against corrupt detectives in the US, a crime cartel trying to silence the one witness that could put an end to their activities, the hero's personal problems in addition to his job-related ones, old legends linked to family histories and so on.
Still, the author manages to keep the story clear, you always know what is happening where.
I enjoyed the things I learned about Iceland, and how the author shows the difficulties of a man who is trying to live in two different cultures. The protagonists are quite likeable, I wish there was a sequel to this book as I would like to know how they are getting on after the solving of this big mystery.