Michael Crichton, the #1 New York Times bestselling author of Jurassic Park, returns to the world of paleontology in this recently discovered novel—a thrilling adventure set in the Wild West during the golden age of fossil hunting.

The year is 1876. Warring Indian tribes still populate America's western territories even as lawless gold-rush towns begin to mark the landscape. In much of the country it is still illegal

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Arrogant and entitled William Johnson, a Yale student with more privilege than sense, has joined world-renowned paleontologist Othniel Charles Marsh on his latest expedition. But when the paranoid and secretive Marsh becomes convinced that William is spying for his nemesis, Edwin Drinker Cope, he abandons him in Cheyenne, Wyoming, a locus of crime and vice. William is forced to join forces with Cope and soon stumbles upon a discovery of historic proportions....