The year is 1876. Warring Indian tribes still populate America's western territories even as lawless gold-rush towns begin to mark the landscape. Against this backdrop two paleontologists pillage the Wild West for dinosaur fossils, while deceiving and sabotaging each other in a rivalry that will come to be known as the Bone Wars. Into this treacherous territory plunges William Johnson, a Yale student with more privilege than sense. Determined to win a bet against his arch-rival, William has joined world-renowned paleontologist Othniel Charles Marsh on his latest expedition. But Marsh becomes convinced that William is spying for his nemesis, Edwin Drinker Cope, and abandons him in Cheyenne, Wyoming, a locus of crime and vice. Soon William joins forces with Cope and stumbles upon a discovery of historic proportions