With millions of people on the move around the world, the novelist Mohsin Hamid has set his latest novel against the backdrop of the refugee crisis. He tells Kirsty Wark how he imagined those fleeing home passing through mysterious black doors into other parts of the world. The lawyer and sociologist Carol Bohmer examines the culture of suspicion which greets migrants when they arrive. She looks at how officials judge the line between truth and deception, and increasingly label people as liars, criminals or terrorists. While many countries are looking to fortify their borders, the former Portuguese Europe Minister Bruno Maçães believes we need to think on a super-continental scale. He travelled overland from the edges of Europe to the heart of Asia arguing for a new world order. But the theatre director Robert Hastie is more interested in what connects people to the land and their origins, as he revives Peter Gill's play The York Realist - a reflection on the rival forces of place, class and longing.