Shortly after, a notification window popped up before him, outlining the details of their main mission. His eyes quickly scanned the keywords: Orient Express, Jack the Ripper, and Sherlock Holmes. In that instant, the setting of this match became unmistakably clear to him.
It was a mystery set in Europe in the late 19th century. The mystery part was very obvious just by reading the main mission prompt. But the timeline was according to the characters involved.
Jack the Ripper and Sherlock Holmes.