Boss Spearman, a rugged old-timer, free grazes cattle. He and Charley have been partners for ten years. The pair and their employees, Mose and Buttons, are driving their cattle across the West. Mose is attacked and thrown in jail during a visit to a town. The local cattle rancher, Baxter, wants the free grazers off his land and when Boss and Charley retrieve Mose, they are warned that they have until the next day to be out of the area. Charley confesses...

In northern Australia at the beginning of World War II, an English aristocrat inherits a cattle station the size of Maryland. When English cattle barons plot to take her land, she reluctantly joins forces with a rough-hewn stock-man to drive 2,000 head of cattle across hundreds of miles of the country's most unforgiving land, only to still face the bombing of Darwin, Australia, by the Japanese forces that had attacked Pearl Harbor only months earlier...

The Duttons face a new set of challenges in the early 20th century, including the rise of Western expansion, Prohibition, and the Great Depression.