The sky is black with ash-fall. People are standing in the streets, looking up into the fog. They hold out their hands, and little mounds of grainy black stone gather. Down the clay-walled guinnels of the town you hear the cathedral bells ringing a discordant pattern, as though God himself is beating the life out of them. The ground jumps and growls underfoot. You look around, into the faces of your neighbors, and wonder what sin you have committed to deserve this. Then you see the first of the slow-rolling waves of lava, inching their way down the mountainsides towards …