A groundbreaking book, this unprecedented study is the authoritative account of the best-known intelligence organization 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.

'Judicious and fluently written history...a fascinating insight into a hidden world, an impressive work of scholarship with terrific photos' --Andrew Lownie, Sunday Telegraph, 26/09/10

`A very fine book...full of episode and personality' --Peter Hennessy, Daily Telegraph, 25/09/10

'A magisterial account of the two wars in particular, viewed via the prism of secret intelligence. Winningly, it also entertains.' --Mark Sellek, Independent on Sunday, 26/09/10

`Jeffery's monograph is extremely valuable... a realistic picture of a splendid British institution' --Oleg Gordievsky, The Times, 25/09/10

`Fascinating...the book is full of examples of the ingenuity and courage shown by all ranks.'

--Douglas Hurd, Guardian, 02/10/10