Is was said that the ending would be a huge surprise and that it was a great plottwist, but I do not agree. 

The point of the book is that you try to solve a case before the investigators in the book do. I formed my first theory after 25 pages and it turned out I was right. There were a couple of good plot twists on the way that made me unsure of my theory but I stuck with it and I was right. 

So, the book is 464 pages and it is supposed to be really hard to solve the case and it is supposed to be a big surprise ending, but i solved the case after 25 pages. Kinda disappointing. 

It is however a good story and an interesting form of book that was very special to read, and I would very much like to read more book of the same kind! 

A note to all crimewriters however: I have noticed ther when you this clearly state that it has a surprice ending that NO ONE could see coming, it is ALWAYS the same solution and the same type of killer, that's why I was able to solve it so quickly.