The twelve (2012)

The great viral plague had left a small group of survivors clinging to life amidst a world transformed into a nightmare. Led by the mysterious, charismatic Amy, they go on the attack, leading an insurrection against the virals--the first offensives of the Second Viral War--infiltrating 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?