Murder on the Orient Express

There is a legendary train that since October 4, 1883, connects Paris with the old Constantinople, now Istanbul, and is known worldwide as the Orient Express. You are in a first class carriage when suddenly, a chilling scream echoes throughout the train. What you've just heard leaves no room for imagination: Someone has just committed a murder on the Orient Express. Panic takes over and passengers have fear etched on their faces. Your task as an investigator will be to solve this delicate police case. You've gathered all the passengers in a carriage and are questioning them but none of them, at least apparently, have a motive to commit such a crime. The train will arrive at its destination in exactly one hour and the main problem is that you have no power to hold anyone without an arrest warrant. You have only 60 minutes left to: Find out who the murderer is, find the murder weapon, and finally, identify the victim as the body hasn't been found yet. Good luck!!!