A series of fiendish murders has struck London with terror. No man or woman is safe from the monster committing the crimes. Sherlock Holmes and Doctor Watson are brought in to investigate the case by the Good Queen Mary of Scots. As they pursue the criminal the trail of death becomes more and more bizarre. Soon they are facing what appear to be creations from hell as they strive to bring the mastermind of evil down who is murdering everyone. Will even they be vanquished by the evil let loose? The game's afoot, but will they win it? An exciting tale of adventure in a parallel London where magic and science both exist, where demons are as likely to be the criminals as hardened criminals.