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There's the scarlet thread of murder running through the colourless skein of life, and our duty is to unravel it.

After a harrowing tour in Afghanistan, Dr Watson returns to London to convalesce at 221B Baker Street, home to the enigmatic Sherlock Holmes. Their lives are irrevocably thrown together by news that a man has been found dead in a grimy 'ill-omened' house, with the ...