The movie is pretty much a different story with the same themes. The book is much more complex and less allegorical than the movie. It isn’t just one journey into the zone and there are actually several zones across the world in the book as well as it is explicit that aliens came to earth hung about for a bit and just left. The zones are where they landed and cause strange things and mutations to people who stay in them too long but there are artifacts to be found that are the leavings of the aliens and that is all I can really say without spoiling the story.
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