I have just read this beautiful and amazing book.
Here is the opening paragraph;
'Although it is nearly midnight, an unusual light slips through a crack in the wool, brushing her arm like the feathers of a wing. In the next room her parents sleep, and the darkened village is silent, but she has lain awake all these hours and now she climbs out of bed, the floorboards rough against her feet. For weeks people have talked of nothing but the comet, how the earth will pass through clouds of poison vapours in its tail, how the world could end. She is fifteen, and all day she and her brother helped seal the house - windows, doors, even the chimney - with thick black wool, hammers tapping everywhere as their neighbours did the same.'