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On the sign:
The Red-Headed League You can earn £4 a week copying, out the Encyclopaedia - provided you have red hair. Holmes finds it a ’three-pipe problem’, ominous rather than eccentric, and takes Watson and the ’Yard’ to the cellars of a London Bank where a shipment of gold has arrived from Paris. They await developments.
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 Red-Headed League"