Sami Shah's fantasy/horror novel, Fire Boy, is set in Karachi, Pakistan – and it's riddled with soul-stealing djinns (shape-shifting demon/genies made of smokeless fire) and various other nightmarish creatures from Muslim mythology. Sami chats with fellow writer Nadia Niaz about genre (and particularly, horror) fiction originating beyond the Anglosphere. What creepy spirits lurk under Malaysian, Moroccan and Mexican beds? Do demons and monsters share similar qualities across the world? Or do their powers reflect something of the culture of their origin?