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.