No matter when it was, Holmes was the smartest man in the world, but 6 months after the last case ended, there appeared a villain who was intellectually equivalent to Holmes: Professor Moriarty. In addition to having a clever head, Moriarty is also a person with no conscience and morality, which puts Holmes into many crises.
The Austrian crown prince died suddenly. Although the inspector of Leschud believed that the crown prince committed suicide after the investigation, Holmes believed that the crown prince was the victim of a murder. This murder that shocked the world is actually just a prelude to Professor Moriarty's beginning his dark reign. Sherlock Holmes, who found the clues of the murderer, followed the clue, but he did not expect that the clue took him to a tavern. A few years ago, he and his brother and Watson celebrated Watson's last bachelor night here.
In this tavern, Holmes met Sim. She was a gypsy astrologer. She saw the murder happen, but she didn’t tell Holmes everything because her astrology turned her into Professor Moriarty's next murder target. In order to protect his witnesses, Holmes began to be responsible for the safety of his Sim, and in return Sim promised to help Holmes solve the case.
Following the clues, Holmes, Sim and Watson traveled across the European continent, from England to France, Germany, and finally stopped in Switzerland. But Professor Moriarty seemed to know Holmes' whereabouts in general, each time he could harm an innocent person in advance, and then Holmes escaped.
