Officer Kevin Derringer visits his sister Elizabeth Downing, and learns of the turmoil within the household. A few months later, he receives a panicked call from Elizabeth and rushes to her aid. On the way, he passes a Convenience Store in the midst of an outbreak, forcing his police tactics to kick in.
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.