It’s one of the ironies of Indian writing in English, that while a thousand works of literary fiction bloom in every shop window, there are few Indian thrillers, or spy novels around—and hardly any that have broken through in the competitive overseas markets. Bunker 13 promises to be a trail blazer; it’s already been sold for handsome sums of money to Farrar, Straus and Giroux in the US and Faber & Faber in the UK.