A Film That Captures Some Edgy, Fearful Truths

Kabul, July 2009 -- I've come back to the Afghan capital again, after an absence of two years, to find it ruined in a new way. Not by bombs this time, but by security.

The heart of the city is now hidden behind piles of Hescos -- giant, grey sandbags produced somewhere in Great Britain. They're stacked against the walls of government buildings, U.N. agencies,...