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

Exactly the movie you think it is, but not the movie you want it to be.

The film never slows down or bores, plunging from one harrowing sequence to the next.

I think this is a new genre that they're all sort of working their way through it and haven't got all the kinks worked out yet but it's a genre that works for me.