A war hero, invalided home from Afghanistan, meets a strange but charismatic genius who is looking for a flatmate - it is London in 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 walls around London, and the first person to see it dies within hours of reading it. Can Sherlock and John solve the case?

A strange clue in an empty room, a blood-soaked car, a priceless Old Master, a deranged bomber. 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...