When the zombie invasion starts there isn't time to stop and think. Amber and River Parker don't know how they're going to get out alive with their parents, little brother, or family friend. They don't know why the zombies act so differently from each other. They don't know why armed gangs have suddenly taken to killing and massacring people. They're not sure if they'll ever make it home. And they certainly don't know that they're the best chance humanity has to stopping civilization from ending. All they know is if they want to live... they need to run.