Solution to the puzzle Sleuth

Sleuth is one of the puzzles of the Melbourne University Puzzle Hunt 2005 competition co-created by the founder of WikiLeaks, and likely organizer of the Cicada 3301 community, Julian Assange (the other author of the puzzle is Andrew Kwok). This is an interesting and original task. At the same time it is quite voluminous, and its peculiarity is a large amount of irrelevant information. According to the plot of the game, you find yourself inside a mysterious dark castle, where you become a witness of a strange conversation. 7 people take part in the discussion, and they all speak different languages. One of them is the host; he speaks english. The other 6 people are his guests; they speak Chinese, Dutch, French, German, Italian and Japanese. Apparently, a terrible crime has occurred in the castle, and the host suspects one of the guests. Together they try to unravel this case… It's easy to see a reference to the board game Cluedo. This exciting game wa...