Ermergerd-Lock: The Blind Banker (Sequel to A Study in Pink)

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. Ermergerd-Lock plunges into a world of codes and symbols, prosulting with London's best graffiti artists. He soon learns that the city is in the grip a gang of international smugglers, a secret society call the Black Water Flower. A lot of swears!