A car left on a level crossing causes a crash which kills fifteen people though the driver cannot be found. Initially the police, led by Natalie Chandler's replacement, the recently promoted Wes Leyton, suspect the car owner, the unpleasant Michael Gennis, but learn that the car was stolen and the actual driver, Finn Tyler, intended to kill himself by driving onto the track but..从前有只西瓜,他老是迷路,于是去买了个指南针。终于成功地找到路的时候,他变成了一只南瓜。。