This is my favourite episode of the brilliant series featuring the best Holmes and Watson of all adaptations. It's engaging, spooky, mysterious, heart-warming, and absolutely hilarious. I've seen it at least a dozen times and still laugh out loud. The attention to detail is amazing, everything is perfect: the interiors, the costumes, the music - oh, the music is wonderful! There are no small roles here: Barrymore, Mrs Hudson, Dr Mortimer, even the dogs are fantastic. An absolute must-see.