It's called Delta Gold -- caviar from the endangered Mississippi River paddlefish that rivals the world-renowned beluga. And now that greed has all but decimated a billion dollar Caspian Sea industry, the Russian mafia is casting its lethal line into the land of ElvisTennessee is the purgatory where the U.S. Fish and Wildlife Service has consigned Rachel Porter for making trouble. Now, posing as a dirty agent on the take, she's diving into a shark pool of hungry predators drawn by the scent of big money. But there's more roiling these waters than a thriving trade in the illegal poaching of paddlefish for their roe -- as Rachel's investigation reveals even scarier secrets...and murder. In guarding the golden egg, Rachel has gotten in way too deep over her head. And now she's in grave danger of learning the meaning of "extinct" firsthand.