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"Defend the Realm" reveals the precise role of the Security Service in twentieth-century British history, from its foundation by Captain Kell of the British Army in October 1909, through two world wars, up to and including its present roles in counterespionage and counterterrorism

Intelligence service --- Service des renseignements --- History --- Histoire --- Great Britain. --- Service des renseignementsHistory --- HistoireGreat Britain.History --- History. --- UK Security Service --- Imperial Security Intelligence Service (England) --- MI5 --- Counter intelligence --- Counterespionage --- Counterintelligence --- Intelligence community --- Secret police (Intelligence service) --- Public administration --- Research --- Disinformation --- Secret service