Moonfall — Jack McDevitt

In five days, comet Tomiko will shatter the moon. Huge chunks will rain down on the Earth, causing continent-wide fires, killer storms, and tidal waves as tall as mountain ranges.

Five days to save a world.

Five nightmare days for the reluctant Russian rocket jockey entrusted with Earth's future; for the woman astronaut who may be the last human on the Moon; for the scientist who must deflect the "possums" (POSSible IMpactorsl or witness the end of science itself. And for Vice President Charlie Haskell, the career politician who discovers unexpected reserves of courage and principle as he makes choices not only for himself and his country, but for all humankind.

Moonfall is McDevitt's masterpiece--a heart-stopping drama of heroism and hope played out against the awesome spectacle of the darkest night in human history.