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The freighter Oceania sailed from the port of Marseille, France, intending to return to Japan, stopping at major ports in Asia along the way. On this day, the Oceania sailed to the Indian Ocean. Four special people on the ship who were accustomed to chatting after dinner, the captain, the purser, the ship's doctor, and a classical literature scholar who had studied in France for three years and returned to China on this ship, sat together again, drinking coffee. That night, the four people's topic focused on a murder mystery that had caused a sensation in Paris not long ago. "The police in Paris are so incompetent!" The purser said first, "Scotland Yard and the Japanese Metropolitan Police will definitely not make this kind of mistake." "No! That's because the murderer had one advantage." The captain said, "No clues were left at all. He is really a criminal genius."