A book 19 years in the making, The Loneliness of Sonia and Sunny by Kiran Desai is a spellbinding story of two young people whose fates intersect and diverge across continents and years – an epic of love and family, India and America, tradition and modernity. Robert Kirkwood asks Kiran about her writing process, casting the audio version and where to get a good kebab in New York.