Sherlock Holmes and Watson were on the hunt for the elusive Guardian Angel, a serial killer who had been terrorizing the city. They had been following the clues for weeks, but the killer always seemed to be one step ahead of them.
Meanwhile, the relationship between Holmes and Watson was strained, as Watson still grieved for his murdered friend and Holmes was trying to mend their differences. But they both knew that the case was too important to let personal issues get in the way. As they dug deeper into the case, they discovered that the killer had followed Holmes from his own world to this alternate history world, making him even more dangerous. They also learned that James Moriarty, Holmes' arch-nemesis, had been abducted and cruelly tortured. A rescue attempt was made, but it failed and Moriarty became lost in the chaos. Then, out of nowhere, a traumatized James Moriarty reappeared in London, but he had no memories of who he was before, nor what he was doing. All his memories of Doctor Watson had become clouded and lost to him. Holmes and Watson knew that this could be a major clue in their investigation. However, before they could act, Moriarty fell into the hands of a shady sailor with dark motivations. They knew that James was in danger again and time was running out. Holmes and Watson had to act fast to save him and stop the Guardian Angel. Will their skills and determination be enough to stop the Guardian Angel, and save their friend James Moriarty?