Murder on the Orient Express

This book although crafted like many of Agatha Christie's previous novels, this ending completely different. Instead of one or two culprits--there was a train full of them. It was also of the few mystery that the murderers act was justified. I found very interesting was the addition of two, their purpose to help Hercule Poirot to solve the case. Of course, as is suspected they do not contribute much except the few outlandishly wrong suggestions. Hercule's helpers, Dr. Constantine and M. Bouc, I thought were important because even though they were useless, they represented the ordinary, person. I can guess this is true because several times I bet they voiced some of the solutions readers imagined. One of the more amusing parts of the book was the many stereotypes about nationalities that were thrown about and sometimes were the obstacles blocking the truth. Another reason why I found it so amusing was because most of the time the stereotypes to led to such irrational thoughts. Every time I read a Hercule Poirot, I gawk at how much information is given away through emotions, because Poirot many he analyzes the emotions of the murderer. But as I could not help wondering,would happen if Poirot meets killer who does not act on emotion or doesn't follow normal thinking? It would difficult to solve his usual methods. Hopefully Agatha Christie has already thought of this.