Before he was Sherlock's rival, Moriarty fought against the unfair class caste system in London by making sure corrupt nobility got their comeuppance. But even the most well-intentioned plans can spin out of control--will Moriarty's dream of a more just and equal world turn him into a hero...or a monster?

There's a serial killer on the loose in the poverty-stricken East End of London that the citizens are calling Jack the Ripper. An old friend of William Moriarty asks him to get to the bottom of the situation, but time is running out. Terrified of Jack the Ripper, the people of the East End try to take matters into their own hands, and their civil unrest threatens to break into a riot when Scotland Yard tries to stop them! Will William be able to bring peace and order back to the people and capture the criminal? Or could there be more than one Jack the Ripper?