The Defence of the Realm

'Sensationally good ... A riveting story, the real-life spooks and spies far more compelling than anything you will see on the screen ... history doesn't come more fascinating than this' Evening Standard
For over 100 years, the agents of MI5 have defended Britain against enemy subversion. Their work has remained shrouded in secrecy - until now.
This first-ever authorized account reveals the British Security Service as never before: its inner work