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

The thing I enjoyed most about the film is the fact that it doesn't shy away from being a super-sized-cliche;

Blistering performances.

The movie is made so realistic it has a lot of that WoW feeling at the right moments and never tooo over the top. the suspense is done so well and the emotion is felt. Very well put together with the music and all.