When the impetuous Persis Allen marries Union Pacific railroad baron Alex MacKinney, she gets the life of luxury and frontier adventure she hoped for . . . at a price. Caught up at once in the lusty drama of Territorial Montana, she meets wealthy cattlemen and glimpses the strange poverty of prostitutes and opium smokers. The parties and balls at first seem like the ideal backdrop for the handsome couple, but a crack appears in this portrait, and no matter how hard Persis tries to mend the fissure, it widens into an abyss of danger.