The 1950s Sheldon Reynolds-produced Sherlock Holmes series starring Ronald Howard certainly took the familiar characters of Holmes and Dr Watson and placed them in some very creative and fun situations. Usually this dedication to making enjoyable little films for television rather than exact replicas of Arthur Conan Doyle's stories would pay off.
This episode deals with the crime that is uncovered when Watson sees a man die of a heart attack on the street, then keeps running into and getting assaulted by his ghost, and it's delightful from start to finish. While the mystery or puzzle is there as much as always (though some elements of it might be a bit for show, as they are rather easy to guess), the episode is really carried by how consistently witty the script is. It's really Sherlock Holems played for dry humor, and Howard and H. Marion Crawford really have a knack for transposing the immortal characters to that ind of story. Whole long sections of the episode are devoted merely to Holmes and Watson talking in Baker Street, but it advances the plot and is plain funny the whole way through.
The best moments perhaps are the punchline at the conclusion (which I will allow to remain a surprise) and a great recurring gag about Watson's reaction when people misinterpret his black eye. This a pure enjoyable, grin-inducing episode that shows off the good, creative writing on the show and the presence of the actors who pull it off. One of the better entries in the series I've seen.