Chastised for not cooperating with the oil company giant New World Petroleum, zoologist Cassidy Lowell is reassigned from the jungles of the Niger Delta to Yellowstone National Park, where wolves are disappearing. Jake Anderson, Special Forces operative, is working within the shadows of Cassidy's organization, Zoological Environmental Bio Research Agency. An alarming genetic mutation of the parvovirus is discovered: CPV-19: human parvovirus merged with canine, and the virus is loose in Yellowstone. Murder, execution, and deadly helicopter rides lead Jake and Cassidy down a road rife with double-crossing and an underlying plot that forces them back to the Niger Delta.