Lucifer's Hammer.

Hammerfall is much slower and subtle than previously thought.

Lucifer’s Hammer has one of the best introductions in any book. The moment you turn beyond that page, though, you’re into the inevitability of a comet striking the earth, knowing it before the characters you’re introduced to in the initial chapters of the story even know.

It’s become a legendary book since its publication decades ago, as well as a kind o…