I just saw the movie not long ago and thought it was a pretty good adaptation. The actors cast for the characters fit the impressions I got from the book pretty well and they did a good job of keeping the plot the same for the most part. All in all, again, it was a pretty good adaptation. However, I'd have to recommend that anyone liking the movie read the book by Christopher Pike. He's one of the best "teen/young adult" writers out there and does a great job at writing books about teens but not solely meant for teen readers. In comparing the movie to the book, the book (like the vast majority of books made into movies) is undeniably better simply because it can be more in-depth. For those not interested in the book however, Fall Into Darkness definitely gets a high-end rating as far as TV movies go.
Review of Fall Into Darkness
