When the largest, most complete fossil of a Tyrannosaurus Rex is discovered in Absaroka County, it would appear to have nothing to do with Walt. That is, until the Cheyenne rancher who finds her is found face down in a turtle pond. As a number of parties vie for ownership of the priceless remains, including rancher Danny Lone Elk's family, the Cheyenne tribe, the Deputy Attorney General, and a cadre of FBI men, Walt must recruit undersheriff Victoria Moretti, Henry Standing Bear, and Dog to investigate a sixty-six million year-old cold case that's starting to heat up fast.