Robert Smith is an outstanding doctor, devoted to teaching at a local university in Mexico City. During a trip to Vietnam he suffers a violent assault at the hands of a group of terrorists while he was being intimated with a local girl. After his arrival he discovers that he has contracted an incurable disease; traumatized by the attack and his illness, he will begin a downward spiral into madness; becoming a cold blooded serial killer convinced that each new victim represents another chance for redemption. *(English Subtitles) El doctor Roberto Smith es una eminencia de la medicina, dedicado a la docencia en una universidad del Distrito Federal. Durante un viaje a Vietnam sufre un violento asalto a manos de unos terroristas mientras se encontraba con una joven. A su regreso descubrirá que la chica lo ha contagiado de un padecimiento incurable; traumatizado por el ataque y su enfermedad, comenzara poco a poco a perder la razón; convirtiéndose en un despiadado asesino a sangre fría que mata convencido de que cada nueva victima es una nueva oportunidad para salvarse.