Middle school English teacher Gabriel Walker always joked that his students were going to kill him; he never thought it might actually happen. After a mysterious epidemic turns children into psychotic killers who rule the night, the world descends into chaos. Gabriel and a small group of survivors are alive because they hide in plain sight; they broke down their own door, busted in their windows and even took pictures off the wall to make it seem as if the house was abandoned in a rush. The survivors have a system of survival and it works. But when they run into Grace, who might be the last healthy girl on earth, everything changes.