A valuable jewel known as the Blue Carbuncle was stolen from the jewel case of the Countess of Morcar yesterday. A reward of 1000 pounds has been offered by the Countess for information leading to the stone's return. While the police work to trace the missing diamond, Holmes attempts to reunite a Christmas dinner and its owner. But when the detective comes across the jewel, Holmes and Watson find themselves in a race against time to save an innocent man's life. A simplification of Arthur Conan Doyle's Sherlock Holmes for young fans of mystery books.