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Island exploration, blizzard mountain villa, secret room murders, serial murders, what kind of truth is behind all the conspiracies? The sentence "The case has come to light" makes the prisoner unable to hide. The masterpiece of domestic reasoning is coming with great force. The plot of the case is purely original and there is absolutely no plagiarism. Friends who like detective reasoning should not miss it. Also, I am a newbie writing, so please forgive me if my writing style is not good.