Yumi Fuller is a Japanese-American prodigal daughter returning home to the Idaho potato farm she ran away from twenty-five years earlier. Then a freewheeling hippie chick, Yumi (a.k.a. Yummy) is now a fairly responsible parent and a professor. But can she possibly be prepared to face her dying father, her Alzheimer's-devastated mother, her former lover, and Cass, the best friend she left behind?
As she grapples with her conflicted past and uncertain future, Yumi collides with a rollicking band of environmentalists who see her parents' potato farm as the ideal answer in their fight against genetic engineering.