Stephen Pearse and Peter Maryk are doctors who once worked together to research a horrifying virus outbreak in the Congo. Now Pearse heads the Bureau of Disease Control, and Maryk runs the clandestine special pathogens section of the disease detectives- making the two scientists bitter enemies. But when the disease from the Congo re-emerges in America, they must set aside their differences in order to stop a potential worldwide epidemic. Using the blood of one woman who is immune to the disease, they create a serum that might work- if the disturbingly cunning virus doesn't have plans of its own.