Which episode in Conan Li is about the hotel serial murder?

068 Night Duke Killing Event (Event Series)

Introduction: Kogoro and others took the place of Agasa Hiroshi who caught a cold and went to Izu for a reasoning trip. The activity stipulates that if you can find out the organizer of the reasoning trip, you can stay for free and get a disk containing virus programs. Someone dressed as the Duke of Night pushed Conan off the railing!

The strange baron was killed in the night (suspected)

Introduction: Kogoro and others went to take part in Izu's reasoning trip. That night, Jiang Yuan, wearing a mask, fell from the hotel upstairs! The police think it was an accidental death. Is this really just an accident? Then a man dressed as the Duke of Night appeared in front of Conan.

070 strange baron was killed in the night (solution)

Synopsis: Therefore, Lan suspects that the person dressed as the Night Master is Maeda, and remembers what Shinichi said before. Conan reasoned that gangwon's murderer was among the guests who took part in the reasoning trip! who is it?