It's 1933 and Charlie's family's luck has just run out. Oklahoma has been hit hard by the Great Depression and a long drought that have left a dusty wasteland where crops won't grow and jobs are scarce. Then the worst happens: Charlie's father loses his job and can't pay the mortgage. The family must pack everything they have into a rickety truck, pull up their roots, and move far away. But with his harmonica and a familiar song, Charlie keeps hope alive -- through hard times.