While investigating the death of a teenaged girl, the detectives stumble on a pattern of crimes that indicate they are after a serial killer. The suspect, however, puts the prosecutors through an ethical wringer when he discloses his attorney's knowledge of the victims and their whereabouts.

The investigation into the carjacking of a vehicle containing vials of a deadly virus leads the detectives on a search for the first person infected with the virus and a biochemist whose sinister motivations were driven by passion.