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In 1855, mankind had entered the computer age using difference engine technology. The poet Byron became Prime Minister of England and frantically promoted difference engine technology. With the powerful intelligence network built by the Difference Engine, British agents infiltrated the United States and tore it apart. Marx and Engels founded a Commune in New York in an attempt to create a socialist America. At the same time, France under the rule of Napoleon III developed a super difference machine called "Napoleon the Great", and Britain's hegemony was in danger. At this time, the daughter of Byron, known as the "Queen of the Difference Engine", wrote a set of mysterious codes. The endless wealth and power hidden in it made all the forces hidden in the fog of London emerge one after another...