The "Better-Farming Train" slides through the wheat fields and small towns of 1930s Australia, bringing advice to farmers. Amid the swaying cars full of cows, pigs, and crops, a strange and swift seduction occurs between Jean Finnegan, a sewing instructor, and Robert Pettergree, a scientist with an unusual taste for soil. In an atmosphere of heady idealism, they settle in the impoverished Mallee farmland with the ambition of transforming the land through science.