The Hound Of The Baskervilles is the most beloved of all the Sherlock Holmes stories. I first read it when I was in the fourth grade. The most famous version is of course the one with Basil Rathbone as Holmes. I was lucky enough to watch this version with Peter Cushing as our favorite detective. Cushing did a Holmes series of which only five episodes survive and this is one of them. Despite the fact it was obviously shot on a low budget it is very entertaining and Cushing makes for a very enjoyable Holmes (even though Jeremy Brett was shoulders above). The other thing I like about this is that they play Watson as an intelligent and able person (even though he isn't as brilliant as Holmes). In the Rathbone movies they played him as a bumbling dolt! Oh and yes Cushing gets to say "The game is afoot Watson!"
