As I finished reading A Study in Scarlet, a vague and distant recollection hit me about having read a bit of Doyle’s fine detective when I was in school.
Intrigued as I was, I went through the titles of his works and found the one I was looking for!
The Speckled Band
I found an apt description about the story on this post A summary and analysis of Arthur Conan Doyle’s The Speckled Band
When I first read the story, I remember that for most part I kept thinking the gypsies we’re somehow in the act. Only towards the end is the truth revealed.
As Sherlock and Watson waited in the middle of the night, observing intently and looking for any deviation from the ordinary,
I found a parallel in the British TV Series Sherlock when they wait for the abominable bride at Carmichael house.
How shall I ever forget that dreadful vigil? I could not hear a sound, not even the drawing of a breath, and yet I knew that my companion sat open-eyed, within a few feet of me, in the same state of nervous tension in which I was myself. The shutters cut off the least ray of light, and we waited in absolute darkness.
When you see Martin Freeman acting the part of a nervous Watson, one could very well believe this excerpt from The Speckled Band be an explanation of how he was to express himself and his fright as the two waited!