On Christmas Eve, ten passengers board a bus traveling across Texas. Most are heading for home, family and friends. Some are in search of new jobs. One, an Army deserter, is trying to stay a jump ahead of the Military Police. On an empty section of highway, the bus collides with a nomadic biker wired on crystal meth. When the passengers go to his aid, he opens fire on the bus. Terrified, the passengers set upon him and kill him. The murder is witnessed by eight other members of the biker's pack. The passengers flee on the bus with the bikers in pursuit. Forced off the road, the passengers take refuge in an abandoned wrecking yard. As they watch in horror, the bikers surround the place before sending one of their own to bring back the rest of the pack. While the remaining bikers launch probing attacks, the passengers rely on improvised weapons and sheer guts to mount a defense. Their numbers dwindling, the passengers realize they must do the unthinkable in order to survive.