Jack is a serial killer who terrorizes his victims. The killer does his dirty deeds over the course of 12 years, slowly and methodically honing his criminal skills. The development of his sadistic talents is chronicled, showing how he selects his victims and chooses the place to do the killing. Jack's personality is a central part of the story, and the viewer is taken to the inner depths of a sick mind that vividly imagines the next victim and the next method for killing and torturing. By the end, Jack's mind is so twisted that he isn't sure of himself.