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

I gave this film a 9 out of 10, because it was exactly what I expected it to be.

Go in cold, and you're likely to emerge with your blood boiling. This has to be seen to be believed.

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.