Late one night, a mysterious car is brought into the Chicago police impound garage after a deadly traffic accident. The on-call mechanics soon discover the car has a mind of its own. With hundreds of horsepower and two tons of reinforced steel at its command, it's a seemingly unstoppable killing machine capable of outrunning -- and outwitting -- humans.。处在叛逆期的少女Tia在离家出走的途中遭遇车祸。无处可去的她暂住到了同样是车祸幸存者Will和他怀孕的妻子Donna的家中。Will的侄女因为车祸失去了自己的父亲,悲痛不已。Tia在帮助小侄女的过程中逐渐从车祸的阴影中走了出来。Tia与这家人的关系日益紧密,也开始渐渐造成了这家人关系的失衡,Tia将何去何从。。