故事开始于莱辛巴赫瀑布。福尔摩斯不知所终;冰冷的地下墓室,躺着一个叫莫里亚蒂的男人,身上藏着一封密信。没有人知道那里究竟发生了什么,就连华生也不例外。英国苏格兰场督察琼斯和美国平克顿律师事务所侦探蔡斯相遇于此,各怀心事,那封密信却让他们走到了一起。伦敦,莫里亚蒂的犯罪帝国大厦将倾,浓雾笼罩的街道异乎寻常地寂静。一股神秘的邪恶力量悄然潜入:美国商人被施以酷刑至死。咖啡厅里,男孩信使一路将琼斯和蔡斯引向一处郊外公馆;次日,公馆发生灭门血案。二人从美国人会所追查到一个偏僻之处的理发店, The story begins with Reichenbach Falls. Holmes did not know where he was; in the icy underground tomb, a man named Moriati lay with a secret letter in his body. No one knows exactly what happened there, even Watson is no exception. Jones, chief of the Scotland Yard inspectors in the United States, and Chancellor Chase, the Pinkerton law firm, met each other with all their heart and soul, and the secret kept them together. The Criminian Empire State Building in London, Moriarty, leans unusually quietly over heavily smoggy streets. A mysterious force of evil sneaked into quietly: American businessmen were tortured to death. In the cafe, the boy messenger led Jones and Chase to a suburb mansion; the next day, the mansion had a bloodshot case. Two people from the American club to trace a remote barber shop,