Called in by an ex-girlfriend to consult on a case, Patrick encounters the work of a killer who displays a stunning degree of ruthlessness. Bowers is shocked to find that the slayings are linked not just to his own history with a known terrorist, but to his former lover as well -- and that her secret past might hold the key to stopping the crime spree. As layers of intrigue peel away, the city is pushed ever closer to a seemingly unstoppable bioweapon attack.