A planetary epidemic has ravaged the human race, leaving few survivors. Doctors Shift Bader and Anta Chalthoum, previously isolated underground, lead a small team to the surface to begin rebuilding a shattered world. As they rise to search for the living, they finally see the devastation first-hand, and soon realize that survival was only the beginning of their struggle. A new peril emerges - not a mindless bacterium, but a focused, calculating opponent, determined to destroy those who remain. As new enemies close in, Shift and Anta search for answers, and once again find themselves fighting for survival - this time against an evil that will not be deterred until all of humanity is eradicated.