I was totally surprised at how great this film.You could feel your paranoia rise as the film went on and as you gradually learned the details of the real situation.

The performances transcend the film's tropes, grounding it in characters that feel more complete than this subgenre often produces.

While it doesn't offer any answers, it both thrills and makes you think.

One of the most extraordinary films you will see this year. Take that as you want.