When a massive blast occurs just outside the prison walls where thirty-nine-year old convict Johnny Helks has resided for years, he is perplexed to discover that he's the only one left in the entire penitentiary. But what's even more perplexing is the fact that his cell door is unlocked. No longer behind bars, things take a turn for the worse as several nerve-wracking noises beckon him into the realm of an extremely nightmarish scenario...In close proximity to the newly freed prisoner's location, six teenage girls awake inside a bus-all strapped to seats. One girl, Lizzie Janis, has a rather devastating connection to Johnny's checkered past. As quickly as the bickering begins, it ends when the confined girls unexpectedly experience the presence of a monstrous unknown ramming into their shuttered-off school bus from the outer perimeters.And after a strange run-in with an attacker while searching through his empty penitentiary, the mentally disturbed prisoner eventually makes his way outdoors only to see a burning landscape. He then hears distant screams and a bevy of gunshots, which leads Johnny to a bloody scene and the trapped teens; finding a notebook with splayed pages that says, "BOARD THE BUS TO BE THEIR HERO. OR ELSE..."But once Johnny boards the bullet-ridden bus and meets the aghast girls, it becomes clear that massive revelations and repercussions are soon to be in store for all involved.