Many of us live in democracies and believe in government transparency, but the truth is our leaders have considerable scope to engage in secret operations overseas. Rory Cormac talks us through five books on 'covert action,' and some of the countries that have embraced it as a policy tool.

The job of the intelligence services is to understand others and help leaders act more wisely, says the author of a new history of the FBI. There’s a balance to be struck between liberty and security but when the CIA and FBI do not harmonise their intelligence missions, people die.

The senior lecturer in the Department of War Studies, King’s College London, chooses books on the real pioneers of British and American espionage – flawed men who saved lives and made a difference.