This series really does remain one of my "Holmes is extremely neurodivergent, duh" stories and I continue to enjoy it even if I keep wondering if the story will ever actually go anywhere.
In fairness, this is ALSO the problem with the original Sherlock Holmes stories so, you know, true to form.
And also true to Holmesian form, the goal of this book is not to figure it out yourself. It's to be entertained while Charlotte tells you how the somewhat unrealistic deductions work. That is the joy of a Conan Doyle story and it works perfectly here as well.