Ben Rawlence spent seven years as a researcher for Human Rights Watch in many countries in Africa, and seven long visits over four years to the Dadaab refugee camp in northern Kenya. This work forms the basis of his extraordinary book, City of Thorns: Nine Lives in the World’s Largest Refugee Camp, which chronicles the lives of its residents. Ben will be joined by Yohannes, a refugee from Ethiopia who has made the long and dangerous journey across the Libyan desert and the Mediterranean before coming to the UK via the infamous ‘Jungle’ camp at Calais. In conversation with Dylan Moore.