Over 65 million years ago in what is now Cheyenne River Sioux territory in South Dakota, a Tyrannosaurus rex matriarch locked in a ferocious battle fell mortally wounded into a riverbed. In 1990, her skeleton was found, virtually complete, in what many call the most spectacular dinosaur fossil discovery to date. And then another battle began - a "Survival of the Fittest" free-for-all involving commercial dinosaur hunters, gun-toting law officers, an ambitious federal prosecutor, a Native American tribe, jealous academics, an enterprising auction house, major museums, and corporate giants, all making their claim for the dinosaur named Sue (after the field paleontologist who first spotted her bones). At stake: not just Sue's wealth of scientific riches, but her grant-drawing power and vast commercial potential as well. Before it was over, there would be claims and counterclaims; charges of checkbook-polluted science, criminal larceny, and vengeful prosecutions; and devastating prison terms. And the gavel would come down on the largest-ever ($8.36 million) auction price tag for a fossil, paid by Chicago's Field Museum, with help from Disney and McDonald's.