Yes, I know, the Dutch original, Spoorloos, by the same director is supposedly far superior, but since I haven't as yet found or seen it, I can only comment on the American remake. It is definitely the most disturbing movie I've ever seen.
Jeff (Sutherland) and Diane (Bullock in a too-short role) stop at a rest area while on vacation. She goes in to buy drinks, and he never sees her again. Three years later, he meets someone new (Nancy Travis) but is still obsessed with finding Diane. After he goes on TV and pleads for information (you kind of wonder why he hasn't done this earlier, or why there seem to be no other family members looking for her, but I guess these are irrelevant questions) the kidnapper Barney (Jeff Bridges) contacts him.
Along with Jeff, we gradually come to realize what happened to Diane, and we are effectively sickened and saddened. Let me say that the beauty of this film is that other than the kidnapping, we are never shown what happens to Diane, only what Barney makes Jeff experience. Knowing it, but not seeing it (except as what happens to Jeff) is powerfully haunting. And for Sandy fans, the scene in which Jeff returns to the area where Diane disappeared, and envisions her again, makes this film worth seeing for that alone. Sutherland is brilliant and Bullock is at her most exquisitely beautiful. I burst into tears at this haunting and moving scene.
Having said all that, Jeff Bridges' odd accent is annoying and just plain weird. Is it supposed to be Dutch? No explanation given. In any case, I am now unable to see Jeff Bridges in anything without feeling sick. ***BIG SPOILER*** Also, have you ever noticed how in movies it's light outside late at night, even in a forest? This is what conveniently enables Rita to dig up Jeff from his burial spot, and Jeff to see Diane's grave (actually a nice touch there), even though in reality it would be pitch black out there. Despite these and other minor flaws, I liked this film.
To sum up, I'm ambivalent about recommending this movie, since it is so disturbing and absolutely not for kids or even teens, but if you (an adult) enjoy feeling creeped out for a good long while, rent this one. And I'd still like to find the original version.