In the autumn of 1888, after solving the mystery of what would become known as The Hound Of The Baskervilles, Sherlock Holmes and Dr. Watson return to London to discover that the great detective has been accused by Scotland Yard of a series of diabolical crimes against The Crown. Now, with only the help of Holmes' mysterious brother Mycroft and the beleaguered Inspector Lestrade, Watson must take action and prove his friend's innocence!