There's a deficit of good, honest women in the West, and Roy Whitman wants to change that. His solution is to bring a caravan of over 100 mail-order brides from Chicago to California. It will be a long, difficult and dangerous journey for the women. So Whitman hires hardened, cynical Buck Wyatt to be their guide across the inhospitable frontier. But as disaster strikes on the trail, Buck just might discover that these women are stronger than he thinks.

Thomas Dekker is a diamond cutter attempting to reclaim his right to a portion of a rubber empire in the early part of the twentieth century. Tom travels to Brazil to uncover the fate of his father and along the way meets Teresa, a local girl who offers to be his guide in the jungle. Eventually, they encounter three armed men who take them to Lobato, a bandit who knew his father. Once convinced that Tom is his friend's son, Lobato tells him a lengthy story which culminates with his meeting Tom's father, who rescued him from drowning. With the help of "flashbacks" from an obscure South American feature, Tom learns what really became of his father.

The U.S. government recognizes land grants made when the West was under Spanish rule. This inspires James Reavis to forge a chain of historical evidence that makes a foundling girl the Baroness of Arizona. Reavis marries the girl and presses his claim to the entire Arizona territory.