One of the best Sherlock games out there, and one of the best written games I've ever played!
But what struck me about this game is the dialogue. Extremely erudite, observant, faithful to the period, and frequently funny in it's precise wording. You just can't find writing this good in most games (not since the best of the old Infocom and Legend adventures).
So it's almost 10 years old now and probably almost impossible to find, and may not even run on modern systems. But if you're an adventure fan with a literary bent, do yourself a favor, track down a copy, and take a chance.