Hay Festival is working with Rijeka Capital of Culture 2020 in Croatia to commission 28 writers and thinkers from across the continent to reimagine the future of Europe. Four of the 28 join us in Hay this year to preview their ideas and stories. Bonet is an artist from Spain, Cottam a social activist and author of Radical Help from Britain, Kassabova a Scotland-based, Bulgarian-born writer and Teller a novelist and former UN officer. They talk to the translator, editor and writer Sophie Hughes.