In The Final Problem, the original, public version of the final confrontation between Sherlock Holmes and Professor Moriarty was told. Now, at long last, the truth of these events is revealed in The Final Solution.

The year is 1892 and the murder of Sir Anthony Roberts, a prominent young judge, leads Holmes and Watson along a deadly trail that leaves them on the wrong side of the law. From London high society through the depths of the city, Holmes and Watson must battle both Moriarty's forces and those of Scotland Yard in order to clear their good names and stop Moriarty's plan to gain control off the international bank, Credit Lyonnais.