Partnered with Watson, Holmes is reunited with an old ally Rachel Doyle, as he investigates a strange case involving a broken key, treasure, and Freemasons. Now all three are in a dangerous game as they attempt to find the reason for why the treasure was left there and who has the other half of the Golden Key.

Facing the case of history, Sherlock Holmes must team with Rachel and Anthony to help him as he and Watson attempt to capture Jack the Ripper in a case that may even bring the world famous detective to his knees. But as they hunt the Ripper, who knows who maybe hunting them in the Whitechapel district.