'The worst man in London'
A valued member of James Moriarty’s (newly reconstructed) criminal circuit. Not a thug or a murderer, but a criminal of the worst kind. A master in the art of blackmail. His specified duties being to hire the right people to obtain certain ‘data’, and demand money from his victims. If they won’t/can’t pay up, he publishes.
Though there have been whispers that he enjoys what he does a little too much.