A woman who is pleasuring herself while tending to her garden is attacked by a man the media have dubbed "the
Zodiac Rapist". In his office, Detective Sam Dobbs complains that the newspapers are making him look incompetent due to his inability to catch the Zodiac, who has been taunting him with letters and telephone calls. Dobbs has sex with a secretary, while the Zodiac is shown searching for another victim.
An applicant for a job walks in on Dobbs and his secretary, and while the latter runs off in embarrassment, the nude Dobbs interviews the woman, who he intends to use as bait to catch the Zodiac. Dobbs tests how good a lure the woman is by having sex with her, oblivious to the fact that he is being spied on by the Zodiac. Dobbs moves on to another one of his secretaries, while the Zodiac follows the lure to her home, and after mocking Dobbs over the phone, breaks into the house, and forces himself on the woman, and her roommate.
Realizing the significance of the Zodiac's call, Dobbs rushes to the bait's house, but the Zodiac escapes. Annoyed that Dobbs stopped the "famous" Zodiac from ravaging them, the women start a threesome with him to satiate themselves. Afterward, Dobbs returns to his office, and picks up where he left off with the secretary he was with before he left to pursue the Zodiac, who is watching a masturbating woman. The Zodiac calls Dobbs with another clue, then rapes the masturbating woman in her pool, and on her deck.
Dobbs, who is driving around while receiving
fellatio, realizes where the Zodiac is, and rushes there. In order to escape, the Zodiac distracts Dobbs by attempting to drown his victim (who is annoyed by the detective's intrusion) by throwing her into the pool. Back at the office, Dobbs meets with a female officer, who the chief of police has sent to make sure he is doing his job, and not just seducing secretaries. Dobbs and the officer end up having sex, and afterward there is a knock on the door. As Dobbs hides, the Zodiac enters, and tries to sexually assault the officer, but she beats him to the floor, and rapes him as Dobbs looks on in awe.
The Zodiac is arrested, and a voice-over announces, "And thus was the end of the reign of the Zodiac. For his despicable crimes, the felon was ordered to death by hanging. But the sentence was dropped when it was revealed to the jury that the Zodiac was 'quite hung enough' already..."
