At the end of The Passage, the great viral plague had left a small group of survivors clinging to life amidst a world transformed into a nightmare. In the second volume of this epic trilogy, this same group of survivors, led by the mysterious, charismatic Amy, go on the attack, leading an insurrection against the virals: the first offensives of the Second Viral War.

To do this, they must infiltrate a dozen hives, each presided over by one of the original Twelve. Their secret weapon: Alicia, transformed at the end of book one into a half human, half viral—but whose side, in the end, is she really on?