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

Each character in this movie — down to the smallest one — is an individual rather than a type, prone to spontaneous changes of mood and sometimes amusing outbursts of pettiness or ill humor.

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

The film never slows down or bores, plunging from one harrowing sequence to the next.