August, 1888: In a year without a summer, Londoners' thoughts turn to the growing terror in the East End. As the horror of Whitechapel echoes across the Empire, Scotland Yard must turn to the world's first consulting detective for help. Can even Sherlock Holmes find a lone madman in a city of seven million while dealing with pressure from his own cases, the police and the government? But as he closes on a suspect, it becomes less clear who is the hunter and who is the hunted: Sherlock Holmes or Jack the Ripper?