A young man, Willoughby Smith, was found bleeding to death from a stab to his neck. His final words were "Professor...it was she!"....though who SHE is in completely unknown to the Inspector investigating the case. He also held in his hand the spectacles of a woman who is nearly blind they are so strong! Now this Inspector is not dummy...he uses some of Holmes' methods and respects Holmes enough to come to him to discuss the case.
Unlike every other episode in the many Holmes series starring Jeremy Brett, Watson was not in this one...though he was in the original story. Why? Because Edward Hardwicke was unavailable....so they had Charles Gray plays Sherlock's brother, Mycroft...and he delivered many of Watson's lines.
So is this any good? Absolutely. The mystery, though not complicated, is interesting and the very end bloody and well deserved. Overall, a very good installment and one worth seeing.
By the way, I am pretty sure that the folks making this episode did a deliberate nod to the Soviet silent film, "Battleship Potemkin", when you see a closeup of the woman wearing cracked glasses....which is likely because the woman ending up being a Russian.