No difference, or four stars.
Because I completely see it as a new detective story using the name of Sherlock Holmes, I don't think it is more dramatic at all.
In fact, the change is quite big. I didn't expect that the last Moriarty and Irene would be the same person? Well, this change is quite unexpected to me.
The flaw is that the case is very exciting. Sherlock Holmes is still a little nervous as always, but the case does have a deep sense of routine, and I don't really like the episodes where Irene appeared.
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