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Defend the Realm is written by Christopher M. Andrew and published by Knopf Publishing Group. It's available with International Standard Book Number or ISBN identification 0307263630 (ISBN 10) and 9780307263636 (ISBN 13).
To mark the centenary of its foundation, the British Security Service, MI5, has for the first time opened its archives to an independent historian. The book reveals the precise role of the Security Service in 20th-century British history, from its foundation in 1909 to its present roles in counterespionage and counter terrorism.