Betty Malcolm meets Brain Elkhorn, an Indian, at a reception. Brain's father, Chief Elkhorn, is carrying on negotiations with Betty's father, John Malcolm, through the white man's agent in the West, Bart Jennings. At the reception, Brain sees one of the guests substitute a paste necklace for the diamond one that Betty wears, and he forces the man to give up his prize. When he returns the real necklace to Betty without explanation, she thinks that he took the ornament. A few days later Betty goes on a yachting party with friends. While she is holding Brain up to ridicule, by mimicking the native Indian dances, she topples over in the water. Brain rescues her. Meanwhile, Jennings' affairs in the West are not prospering. He cannot induce the old chief to sign the contract until his son, Brain, returns, and passes an opinion on it. So Brain is called west. Betty and her brother, Percy, follow him on the next train; the girl has resolved that she will force the Indians to sign the contract...