This is the second episode of the Sherlock Holmes TV series I've seen that starred Ronald Howard. It's the weaker of the two, though both were awfully weak when it came to the writing.
The episode begins with a woman seeing some weird violinist in her room. She screams and he disappears when folks come to the room. Soon her step-father is talking about institutionalizing her, as she's obviously insane. No other evidence of insanity is shown but soon the woman's fiancé goes to Holmes for help--but it murdered just outside 221B Baker Street. Very obviously something is going on here!!
The biggest problems about this episode are that there is absolutely no doubt as to who is behind everything and that too much of Holmes' ''investigation' is based on prior knowledge. In other words, instead of seeing Holmes investigating, he says that he instantly KNOWS who is behind this because of his past research on the man. Huh? And, at the end, Holmes seems amazingly inept when it came to saving the lady! Not a particularly inspiring or interesting episode.