It's hard to see any effort in the film. There's no comedy to speak of, no real drama and, worst of all.

The film's masterful storytelling did its job. The message was clear. No need to overdo.

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.

Strong acting helps the film overcome an uncertain premise and create characters that hold our attention absolutely.