Tom Joad returns from prison, where he was serving time for manslaughter, to his family's Oklahoma farm and finds the house abandoned. Muley, his half-crazed neighbor, tells Tom about the recent dispossession of the sharecroppers, who have been driven out by drought and the greedy land companies. Tom finally locates his family as they are about to pack their belongings on a dilapidated truck and head West, lured by promises of work and high wages in California. Joined by their friend Casy, a former "fire and brimstone" preacher, the Joads begin their long trek west on Route 66.