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On the sign:
The Speckled Band Holmes and Watson spend a night where a woman has died suddenly and mysteriously. Why do a baboon and a cheetah roam outside? What is the strange whistling heard in the darkness? The sinister owner bends a poker; Holmes straightens it. But Watson takes his revolver to be on the safe side.
221B Baker Street is listed in Arthur Conan Doyle’s books as the residence of Sherlock Holmes. In light of this, the detective figure or quotes from the detective’s stories are displayed in the stations of the lines passing through this station.
The following photo, which is on the Jubilee line, shows a quote and illustration from the story "The Adventure of the Speckled Band"