Xavier Beauvois's film 'The Guardians' tells the story of a rural French family left behind during the First World War while the young menfolk are off fighting at the front. It's a quiet and observational movie, watching the rhythms of the agricultural calendar while human life is in some senses on hold. Unfortunately, the conceit is rather overdone: in six years, we see almost no signs of joy or even simple boisterousness, as if the war shifted everyone into a permanent state of dignified melancholy. The result is a overly slow and solemn story.