Poirot Movie: "Murder on the Orient Express"

The Poirot Movie "Murder on the Orient Express" is about a murder on the Orient Express. Poirot is also on the train, and he solves the mystery. Here's the story:

One day Poirot is living in Istanbul and wants to visit London, and he takes the Orient Express. In the middle of a snowstorm the Orient Express passes in Yugoslavia on the second night and is suddenly snowbound. At midnight Poirot hears a distant scream and wakes up. Nothing happened so he went back to sleep. The next morning one of the passengers-a ruthless American business man Samuel Ratchett is found murdered. He appears to have been stabbed many times and drugged. Who could the murderer be? Poirot sets out to find out. He finds a burned piece of paper that obviously was incriminating. He, with help of a hat box surprisingly finds it says nonsense: "AISY ARMS" Poirot questions everybody on the train, and he notices a fact: everybody-including Samuel Ratchett is related to a criminal: Lanfranco Cassetti and the kidnapping and murder of a young girl Daisy Armstrong in a sad way. But who was the murderer? Poirot soon discovers the truth.