Two episodes from the 1968 TV series based on the famous stories by Sir Arthur Conan Doyle, starring Peter Cushing as Holmes and Nigel Stock as Dr Watson. In 'The Sign of Four', Holmes and Watson are intrigued by the case of Mary Morstan, whose father disappeared ten years previously. Every year since, Mary has received a pearl from a mystery benefactor, and she now requires the Baker Street detective to act as her escort in a meeting with the unknown patron. In 'The Blue Carbuncle', a priceless jewel with a sinister history has been stolen from its owner, the Countess of Morcar. When it is found in a goose's crop, the events surrounding how it got there and who the true thief is are puzzles only a genius such as Sherlock Holmes can unravel. This was the last episode in this series (which was one of the first TV series ever to be shot in colour), and was originally screened on 23rd December 1968.