Want a book to drag you down? This is it. An apocalypse that man is powerless to prevent. This is a story of a comet striking earth and the aftermath for humanity. It starts well in advance with the discovery of the Hamner-Brown comet. Sometimes the timing is a little suspect. I mean the government is able to throw together a mission to space that is a joint mission with the Russians in only a couple of months.
Overall, It was a great read and was exciting from start to finish. Good luck to the human race.