(re: RAMA: Do any of you remember that one?) It is actually rather accurate. Of course, the book has a linear story consisting of primarily exploration, very little action. The game gives you a lot of freedom to explore and has loads of puzzles to make it interesting, but the story develops in pretty much the same way as it does in the book.
It would have to be pretty accurate, since the game shipped with the book in the game box. Anything wildly inaccurate would be very noticeable that way.