Rainbow Halliday, an orphan, is reared by three self-appointed guardians who work the Rainbow Copper Mine, willed her by her father. She is rescued from the advances of Joe Sheady by young easterner George Standish, who claims ownership of the mine but does not force his rights and instead returns to Chicago to marry a former sweetheart. Rainbow's uncle, Rufus, who is taken ill in Chicago, invites her to visit him; there she discovers that Standish's father did not record the sale of the mine, knowing that Rufus had sold the mine to Rainbow's father. Insulted by George's fiancée, Rainbow decides to surrender the mine and returns home; Standish arrives and is held captive by her guardians, but he is rescued by Rainbow when Sheady sets fire to the cabin. He finds love with Rainbow, and the mine becomes their joint property.
—AFI