Book:: The auditors are spiritual beings who control the world- more or less. They decide that people should no longer believe in imaginary creatures, and hire an assassin to kill the Hogfather (same as Santa) to kill the belief. When death finds out about this, he realizes that killing the Hogfather will unravel the world as we know it, so he works to save the Hogfather and Hogswatch. In the end, we find that hope is essential to keeping humanity sane, and if there is no hope and no fantasy, there is no point to life.
Movie: The movie is very similar to the main plot of the book, probably because Terry Pratchet was directly involved. However, the movie is kind of slow, and many of the details in the book are not present in the movie.
Similarities: All of the main plot points and characters are there. The story is essentially the same. I think the portrayal of the characters is done very well in the movie. I particularly like how they did death and Mr. Teatime.
Differences: As I mentioned before, many of the smaller plot points are missing from the movie. It is hard to follow the story in the beginning, because nothing seems like it has anything to do with anything else. It never did make sense in the movie why the wizards were messing around with the shower.
Winner: The book wins. You don’t get the full richness of the story in the movie. I think I only like the movie because I read the book. However, it has been such a long time since I read the book, I think I should read it again. I always enjoy a good Terry Pratchet story.