The rise of the Islamic State (IS) has once again thrown into question how governments deal with the threat of terrorist organisations. Around the world governments consistently proclaim that they will never ‘negotiate with evil’. And yet is the public rhetoric always in line with what is actually going on behind closed doors? Jonathan Powell has spent nearly two decades mediating between governments and terrorist organisations. He will be joining us in conversation with roving foreign correspondent for The Times, Anthony Loyd, to reflect on the current situation and what we can learn from a history of clandestine communication.