The efforts of "seed keepers" to preserve the 12,000-year-old food legacy of humans are examined. Over the past century, seed diversity has undergone a precipitous decline as family farmsteads have given way to agribusinesses that sow genetically identical crops. The problem: without seed diversity, crop diseases can cause havoc to the food supply. As a result, a variety of reluctant heroes have begun to wage a David vs. Goliath-like battle to defend the future of food production.