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. With this extraordinary treasure, however, comes exceptional danger, and William's newfound resilience will be tested in his struggle to protect his cache, which pits him against some of the West's most notorious characters.