The narrative, interrupted by prose-poem interludes, chronicles the struggles of the Joad family's life on a failing Oklahoma farm, their difficult journey to California, and their disillusionment once they arrive there and fall prey to a parasitic economic system. The insularity of the Joads--Ma's obsession with family togetherness, son Tom's self-centeredness, and daughter Rose of Sharon's materialism--ultimately gives way to a sense of universal community.