Britain's spies are coming in from the cold with an authorized history of their early exploits. “MI6” was published Tuesday and tells the story of the country's foreign intelligence agency from its foundation in 1909 to 1949. It is written by Keith Jeffery, a historian at Queen's University Belfast, who had access to previously secret files from the MI6 archive. The stories describe the agency's exploits in World War I and World War II, and contain some sensitive revelations. The book follows the publication last year of an official history of MI5.