MI6: The History of the Secret Intelligence Service 1909-1949

A groundbreaking book, this unprecedented study is the
authoritative account of the best-known intelligence organisation in the
world. Essential reading for anyone interested in the history of
espionage, the two world wars, modern British government and the conduct
of international relations in the first half of the twentieth century, MI6:
The History of the Secret Intelligence Service 1909-1949 is a
uniquely important examination of the role and significance of
intelligence in the modern world.