Her Uncle Oliver, the distinguished astronomer, told Lavina: 'It would be a pity for you to die without the experience of marriage, my dear. A comet is due to hit the earth on the 24th of June and none of us has more than sixty days to live.' Once the cat was out of the bag, things began to happen. A plot to overthrow the Government. Panic, riots, street fighting. London under martial law. Fire...