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On the sign:
BAKER STREET
The Sign of Four Watson and Athelney Jones of the ’Yard’ are at 221B Baker Street, awaiting Holmes who is out searching for the steam launch Aurora and the baneful Agra treasure. An aged and asthmatic visitor arrives, unannounced, with vital information but will give it only to Holmes. Athelney Jones prevents his determined departure. But who is he?
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 Sign of the Four"