Nicky is sick of the violence he sees while driving a cab in the city. On the night of his brother Simon's eighteenth birthday, a gang senselessly beat him to death, and Nicky hopes to find the men responsible.

Nicky rescued Didi, a dancer, from two attackers, and they became friends as kindred spirits who both suffered a tragedy. But they have secrets. Didi's secret is a daughter, and Nicky's is that he is the Northbridge Vigilante who has killed men as they carried out violent crimes. Nicky's last victim was the brother of a drug dealer, Jimmy Mallory, head of a powerful biker gang.

The city explodes with gang warfare, fighting to control the drugs and nightclubs because of the murder of Mallory's brother. The police are closing in on The Vigilante, but so is Mallory, who will stop at nothing to get revenge.

Nicky has found the love of his life and finally someone to live for if only he can stay out of jail, and survive.