The Black Door: Spies, Secret Intelligence and British Prime Ministers

Intelligence can do a prime minister's dirty work. For more than a century, secret wars have been waged directly from Number 10. They have staved off conflict, defeats, and British decline through fancy footwork, often deceiving friend and foe alike. Yet as the birth of the modern British secret service in 1909, prime ministers were strangers to the secret world--sometimes with disastrous consequences.

During the Second World War, Winston Churchill oversaw a remarkable revolution in the expl...