I'm currently reading "When Worlds Collide", a 1933 novel by Philip Wylie and Edwin Balmer. I've seen the (very enjoyable) film adaptation of this several times, but until I came across the book purely by chance on Amazon I didn't know that the film was based on a book
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The plot is that a "rogue planet" is discovered by astronomers, which is going to collide with the Earth in a few months time. Civilisation starts to collapse as the news causes mass panic, and a group of scientists tries to build a spaceship which will take a few people to the new planet to start afresh.
About half way through it so far. Very enjoyable, and also nicely formatted with few errors.