One vaccine dose. The deadliest virus the world hasn't met yet. A mom who has to save her daughter and could die trying. Cady lives out in a rural area and life with her daughter is thrown into turmoil - even with society so far away. Jackson has promised her a vaccine - but only one dose - for the virus he's loosed on the world. Can Cady choose between saving her daughter or leaving her little girl alone in a world filled with questions and fear?...