The shortest Sherlock Holmes story is in a 1.5" book in the library of a dollhouse constructed for George V's wife, Queen Mary. The story was written by Conan Doyle specifically for the dollhouse book:
Watson had been watching his companion intently ever since he had sat down to the breakfast table. Holmes happened to look up and catch his eye.You can finish reading the 503-word story ("How Watson Learned the Trick") at Futility Closet, from whose podcast I first learned about the existence of the book. More about their podcasts later, after I've finished auditing the series.
‘Well, Watson, what are you thinking about?’ he asked.
‘Yes, Holmes. I was thinking how superficial are these tricks of yours, and how wonderful it is that the public should continue to show interest in them.’
‘I quite agree,’ said Holmes. ‘In fact, I have a recollection that I have myself made a similar remark.’
‘Your methods,’ said Watson severely, ‘are really easily acquired.’
‘No doubt,’ Holmes answered with a smile. ‘Perhaps you will yourself give an example of this method of reasoning.’..
Photo [of a different book in the library] via Decor to Adore (scroll down to bottom), where there are many photos of this remarkable dollhouse.