The book tells how Kingsolver and her family moved across country to live in a place where they could grow much of their own food (they couldn't do so in Arizona, where they lived previously). They garden, buy from local farmers and generally spend a lot of time examining American foodways and philosophies.
The few pages I've read so far are peppered with shocking facts and beautiful prose. On the first page, Kingsolver writes, "The tall, dehydrated saguaros stood around all teetery and sucked-in like very prickly supermodels." What an apt and evocative description -- I can't wait to read more.