Madrid, Spain. Year 2001 in the middle of the second Irak War. The main character of the movie (no name) is a psychopath, a sociopath, who hates people and feel the desire to kill everyone. Is a person of calm and normal appearance, but under that skin of a lamb lies a terrible murderer. His mind boiled with terrible thoughts. He asks himself: why can't I not kill people, and politicians can? They can kill thousands, hundreds of thousands and nobody says anything to them, in fact they cheer them as if they were heroes. They can kill people in Iraq without anyone accusing them of murder, without the police chasing them, without receiving any punishment. But he kills one person, just one person and the TV news calls him a murderer and says terrible things about him. He doesn't understand that. This treatment is unfair, from his point of view. For our psycho character, killing people is a necessary thing, a good for society, a way to eliminate unpleasant, silly or unfriendly people. A better reasons than Mr. Bush has for killing, for example, a family that lives thousands of miles away that nobody knows. One day, this tortured psychopath decides to visit a psychologist. The psychologist does not realize that he is really a murderer, and believes that it is only a stressed person who needs a vacation. and advises him to take a few days off in the summer. So, the psychopath gets a quiet and anonymous job as a lifeguard in the pool of a quiet group of houses on the outskirts of Madrid. He believes it will be an easy and quiet job until the few neighbors begin to use the pool. He can not stand their presence. Each of the neighbors do something that irritates the psychopath to the point that he decides to end their life. One by one.