Feeling responsible for the Spanish Flu outbreak in the U.S, David exiles himself to China, where the People's Republic Army kidnaps him to investigate a deadly disease. They discover an ancient bacterium in the village's water system is causing the outbreak. David is shocked when one scientist tests the antidote on herself. A horrific attack takes place at the International AIDS conference.

With less than two days to discover a drug cocktail that will prevent a premature baby from becoming HIV positive, David encounters several bureaucratic roadblocks, as the drug is unapproved. Carlos continues to research the new super strain of HIV with former colleagues in Africa. Mayko and Simon's investigation leads them to the United States. Their results are brilliant and devastating.