Martin is a man who suffers from paranoid personality disorder. At his weekly visit to the psychologist, he's asked to visualize his journey home by bus. While in his visualisation, he is constantly affected and intimidated by the other people in the bus and on top of that he believes that someone in the bus is attempting an attack. The psychologist tries to convince Martin of the fact that he's just visualizing the attack and that it is not real. But it's too late. Someone in the bus demands Martin to kill his psychologist, so that he won't thwart the attack.