In 1999, Gabriel Logan and his partner Lian Xing investigate a series of biological outbreaks triggered by international terrorist group Black Baton led by Erich Rhoemer. When fellow agent Ellis loses contact during a mission in Costa Rica, the top-secret Agency dispatches Gabe and Lian to find him. They discover Ellis is dead, and Rhoemer's suspected drug operation is a cover for the viral operation. Another outbreak in Nepal leads to more questions when an infected person who should have perished somehow survived.