Great start to a mystery!
Sherlock Holmes has always intrigued me since reading the original stories. Sir Arthur Conan Doyle was a physician before he became a writer. The methods Holmes used and many of the "clues" he discovered in those stories (not the movies) are actually the methods and things that a physician of that time would use to examine a patient. Interviewing the patient for clues in the medical history and a guided exam were about all they had to go on. The stethoscope was invented early in the 1800s, but there would have been few if any simple lab tests. X-rays were in the research phase. And of course anything computerized was in the distant future. Watson should have been the one picking up those clues if not actually solving the case, not waiting for Holmes to explain himself, which I now find ironic and funny.
My muse is hinting there's a plot bunny forming, although right now I don't have a clue about it.

She can be rather fickle, so if anyone else has a plot in mind, go for it!