But I always felt that the last murderer should be the daughter of the double, and the characters and reasoning told by the first four detectives were at least half correct.
And in the end, she replied to the detective as Shuang. It was the last trap she set. The short Shuang was indeed dead (maybe this person was just hired), and the housekeeper died as well, but the detectives thought it was. It was just a prank set up to make them fail and chose to leave silently, so that she, as the murderer, was truly successful.
In addition, there is a possibility that the last detective is probably in partnership with the murderer, otherwise there is no reason to say that he is himself to the person who is not himself (the murderer). How could this kind of statement get a million in the hands of the murderer? . So the first four detectives of the murderer were ready to give money, because they all got the correct answers, the last detective went wrong directly, and then logically said that he was a double, no matter how he looked like a collusive sub.
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