John Maytham speaks to Sri Lankan author Shehan Karunatilaka, whose novel The Seven Moons of Maali Almeida won the Booker Prize of 2022 and tells the story of a war photographer who has woken up dead in what seems to be a celestial visa office, and given ‘seven moons’ to try and solve the mystery of his death and to help unveil a cache of photos that will rock war-torn Sri Lanka.