As the morphs, carriers of the disease, become more numerous and aggressive, Joslin and Grant realize they'll have to defend their home to protect their children. As each strand of hope frays away, the risks they must take in order to survive grow larger - until at last, Grant is attacked by a morph. Knowing he's been infected, Grant leaves his family to fend for themselves.
Just when Joslin thinks things can't get worse, her morphed husband returns to their home on day 94. Crazed and delusional, Grant is determined to get into the house. Joslin's unwavering desire to save her children drives the assault, knowing it may cost her life in order to stop her husband, Grant.