Contemporary crime drama, based on the novels by Arthur Conan Doyle. A war hero, invalided home from Afghanistan, meets a strange but charismatic genius who is looking for a flatmate. It is London, 2010, and Dr Watson and Sherlock Holmes are meeting for the first time. A string of impossible suicides has Scotland Yard baffled - and only one man can help.

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.

Faced with a strange clue in an empty room, a blood-soaked car, a priceless Old Master, a deranged bomber, and with the clock ticking, the curtain rises on a battle of wits between Sherlock, John and the shadowy stranger who seems to know all the answers.

Something terrible has happened to Henry Knight; Sherlock and John investigate the truth about the monstrous creature which apparently killed their client's father. A hound from hell? What seems like fantasy in Baker Street is a very different prospect in the ultra-secret army base that looms over Dartmoor.

Moriarty is back, with the most audacious crime of the century, but is Sherlock Holmes all he claims to be? With the world against them, Sherlock and John lock horns with their old enemy in one final problem. The question is, who will survive?