Sherlock Holmes and the Adventure of the Blue Carbuncle

The Adventure of the Blue Carbuncle is of one of 56 short stories by Sir Arthur Conan Doyle and first published in the Strand Magazine in January 1892.

The story follows Sherlock Holmes and Dr. Watson as they hunt down the people involved in stealing a blue gem (or carbuncle) that was discovered in a goose gullet. The first suspect, who turns out to be a red herring is the man in the hat.