The Hinterland of Sherlock Holmes

From the BBC

From Wikipedia

The howls of outrage and disappointment must have been echoing all over the country. That was one of the worst Sherlock Holmes I've ever seen including Peter Cook in Hound of the Baskervilles. Coming on the heels of the scintillating early episodes, this will have made people all the more grumpy. Where did it all go wrong?