Simple and well acted, it has tension enough to knot the stomach.

A great movie, one of the best of this year. There was a bit of confusion at one point in the plot, but nothing serious.

It is neither dumb nor smart enough to be fun, and spends way too much time with its boring human characters.

It's the kind of movie you'll want to see a second time with someone who hasn't seen it yet, to remember what it was like to watch it for the first time.