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Plot

The narrative begins just after Tom Joad is paroled from prison for homicide. On his journey home, he meets a now-former preacher, Jim Casy, whom he remembers from his childhood, and the two travel together. When they arrive at his childhood farm home, they find it deserted. Disconcerted and confused, he and Casy go to his Uncle John's home nearby where he finds his family loading a converted Hudson truck with what remains of their possessions; the crops were destroyed in the Dust Bowl and as a result, the family had to default on their loans. With their farm repossessed, the Joads cling to hope, mostly in the form of handbills distributed everywhere in Oklahoma, describing the fruitful country of California and the high pay to be had in that state. The Joads are seduced by this advertising and invest everything they have into the journey. Although leaving Oklahoma would be breaking parole, Tom decides that it is a risk worth taking. Casy joins the family as well.

Going west on Route 66, the Joad family discovers that the road is saturated with other families making the same trek, ensnared by the same promise. In makeshift camps, they hear many stories from others, some coming back from California, and are forced to confront the possibility that their prospects may not be what they hoped. Along the road, Grampa dies and is buried in the camp; Granma dies close to the California state line, both Noah (the eldest Joad son) and Connie (the husband of the pregnant Joad daughter, Rose of Sharon) split from the family; the remaining members, led by Ma, realize they have no choice but to go on, as there is nothing remaining for them in Oklahoma.

Upon arrival, they find little hope of making a decent wage, as there is an oversupply of labor and a lack of rights, and the big corporate farmers are in collusion, while smaller farmers are suffering from collapsing prices. A gleam of hope is presented at Weedpatch Camp, one of the clean, utility-supplied camps operated by the Resettlement Administration, a New Deal agency that has been established to help the migrants, but there is not enough money and space to care for all of the needy. As a Federal facility, the camp is also off-limits to California deputies who constantly harass and provoke the newcomers.

In response to the exploitation of laborers, there are people who attempt for the workers to join unions, including Casy, who had gone to jail to cover for Tom's attack of a deputy. The surviving Joads unknowingly work as strikebreakers on a peach orchard where Casy is involved in a strike that eventually turns violent. Tom Joad witnesses the killing of Casy and kills the attacker, becoming a fugitive. He bids farewell to his mother, promising that no matter where he runs, he will be a tireless advocate for the oppressed. Rose of Sharon's baby is stillborn; however, Ma Joad remains steadfast and forces the family through the bereavement. When the rains arrive, the Joads' dwelling is flooded, and they move to higher ground, where Rose of Sharon breast feeds a man too sick from starvation to eat solid food.