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A mysterious cipher is being scrawled on the walls around London. The first person to see the cipher is dead within hours of reading it. Sherlock plunges into a world of codes and symbols, consulting with London's best graffiti artists. He soon learns that the city is in the grip a gang of international smugglers, a secret society called the Black Lotus.
First Air Date : Jul 25, 2010
Last Air date : Jan 15, 2017
Episode : 12 Episode
Season : 4 Season
Runtime: 90:14 minutes
Studio: BBC One
Country: United Kingdom, United States of America
