Sherlock Holmes is dead.
Days after Holmes and his arch-enemy Moriarty fall to their doom at the Reichenbach Falls, Pinkerton agent Frederick Chase arrives in Europe from New York. The death of Moriarty has created a poisonous vacuum which has been swiftly filled by a fiendish new criminal mastermind who has risen to take his place.
Ably assisted by Inspector Athelney Jones of Scotland Yard, a devoted student of Holmes's methods of investigation and deduction, Frederick Chase must forge a path through the darkest corners of the capital to shine light on this shadowy figure, a man much feared but seldom seen, a man determined to engulf London in a tide of murder and menace.
The game is afoot...
The great detective and his greatest enemy are dead—or so it is said.
"After the confrontation that the world has come to know as 'The Final Problem,' [though] there was nothing final about it, as we now know," (p.4) Sherlock Holmes and Professor Moriarty have absented their respective roles, each for his own secretive reasons. So what's Scotland Yard to do when London is rocked by a series of crimes so indescribably violent that they rival the Ripper's?
Why, hand over Holmes' role to Inspector Athelney Jones: a man, you might remember, much maligned by Dr Watson's depiction of him as a total dolt in 'The Sign of the Four.' Since then, however, Jones has "read everything that Mr Holmes has ever written. He has studied his methods and replicated his experiments. He has consulted with every inspector who ever worked with him. He has, in short, made Sherlock Holmes the very paradigm of his own life." (p.146)
And in our narrator, Frederick Chase—apparently the pick of Pinkerton's Detective Agency—Jones' Holmes has his Watson.