First of all, the premise of my analysis is: In this movie, if two or more people appear in the same scene, it is deemed that they can prove to each other that what they did is true and the scene is true. Because if this premise is missing, almost all reasoning will not be able to proceed. We need to analyze based on what the movie itself tells us.
Then according to the description of the movie, it can be inferred: there are organs in the whole building, so people may move quickly in the building; the disguise technology is very mature, so disguise will not be discovered; the dressing can be realized quickly (butler and Pierre's paragraph).
The next key point is the chef. After the dinner began, the cook ran out in horror and took out a note stating that the butler was dead. But I have already explained that this cook can't read or write. Therefore, I think the screenwriter here implies that our cook is a problem.
Based on this, I propose a hypothesis. The whole game was planned by the chef who showed up last. She had already killed Mr. Shuang and the group of people mentioned at the end of the film. The reason she invited these detectives was to fool them on the one hand, and on the other hand. It is to cover up the fact that these people died.
The whole story can be like this: After the cook kills Shuang and related personnel (except the housekeeper), she pretends to be a Shuang and invites the detectives, and then arranges the room. After the detectives came one after another, they returned to the kitchen and went into the kitchen to see the housekeeper. (But she actually didn't do anything in the kitchen, so she had time to make other plans) After the dinner began, she appeared in front of the crowd pretending to be double, and exited the hall after speaking a few words. After that, she went to the kitchen to kill the butler, and regained her appearance as a cook, and appeared in front of everyone to inform everyone that the butler had died. The next step is to switch the hall. After diverting everyone’s attention, the cook slipped out of the hall (and didn’t say how she slipped...anyway, no one paid attention to her) came to the kitchen and changed the housekeeper’s body into Mr. Twins, after inserting a knife behind the corpse , Let the body appear in front of everyone on time at twelve.
Finally, it was the scene where everyone came to announce their answers. The cook waited for the detectives to arrive and sat in the room after a double disguise. As long as the detectives realize that "Mr. Twin" has fooled them and leave, her plan will finally come true. It can be said to be a swindle.
In addition, that Sam Diamond must have had a deal with what he thinks is "Mr. Double", otherwise he doesn't need to pretend to be that JJ Ruomis. It should be "Mr. Double" who told him before that I want to play a trick with the other four detectives. I'll give you a sum of money and you can help me. He thought he had participated in the "Mr. Double" detective scheme, but he was still fooled.
The above is my interpretation of this case. And this is just a reasonable interpretation (if anything is unreasonable, please point it out), I believe there are other reasonable and reasonable interpretations. For this kind of detective suspense works, it doesn't matter what the truth is, as long as you have a set of explanations that are reasonable and can convince yourself.
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