Dr. Mark Downing must battle his own guilt while at the same time trying to protect what may be the only part of humanity left in a world overrun by zombies.
Emma Gracely struggles to make a new start because of her traumatic past. Her son, Jaden Gracely, adjusts to school by attending summer classes. He meets a popular girl named Marie, who shares a similar troubled past. When the zombie outbreak hits the school, Jaden and Marie fight to reach their mothers and survive the encroaching apocalypse.