Sheriff Penny Miller of Flat Rock, Nevada, has always done her duty. On the first night of the zombie apocalypse, she swore an oath to protect her friends from the ravenous hordes. However, now that the virus is rapidly spreading to the rest of the country it has become clear that Miller and her friends, Scratch, Sheppard, and Rat, are winning battles but losing the war. And that's just not good enough for Penny. Too many people have already died...