It is 1894, and Sherlock Holmes is called to a Covent Garden art gallery where dozens of patrons lie dead before a painting of the Undying Man.
Holmes and Watson are soon on the trail of a mysterious figure in black, whose astounding speed and agility make capture impossible.
The same suspect is then implicated in another murder, when the servant of a visiting Russian grand duke is found terribly mutilated in a notorious slum.
But what links the two crimes, and do they have anything to do with the suicide of an unpopular schoolteacher at a remote boarding school?
So begins a case that will reveal the dark shadows that past misdeeds can cast, and test the companions to their limits…
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