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

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

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

There are moments in this movie where the great movie it could've been peek out... They're fleeting, here, but they're worth savoring, and they happen often enough to make it worth your while.