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. —British Broadcasting Corporation
I noticed that several people found this episode distasteful or lacking. Yes, compared to A Study in Pink it is not as strong, but A Study in Pink was more of a character driven episode, whereas The Blind Banker focuses more on the exotic adventure that Doyle loved so much. What isn't to love about death traps and Chinese acrobats? The absurdity works here.