David receives a phone call that will change his life – a mysterious, distorted voice who identifies himself as Zero orders him to do his bidding, otherwise someone he loves will die. David hangs up the phone on Zero. Hours later, his wife, Julie lies in hospital, the victim of a hit and run. Zero and David form an uneasy alliance; with David reluctantly agreeing to do Zero’s bidding. His first assignment – to hunt down and catch the Bukit Aman Rapist, a sex predator who has been terrifying the neighbourhood.

As the Bukit Aman Rapist can now identify David, Zero forces David to hunt him down and kill him. In addition, David must also contend with a pair of International Robbers who have brutally beaten and robbed Julie’s mother. Meanwhile, Maddy is beginning to suspect that David is having an affair.

Winnie re-enters David’s life with an ultimatum of her own – she wants David to finish what he started years ago and take down Roy, her ex-boyfriend who raped and brutally beat her. She reveals that she knows David’s secret – that he is the so-called vigilante who killed the Bukit Aman Rapist and the International Robbers. David wonders if Winnie is behind the whole Zero affair.

Things come to a head at home when Julie confronts David about his supposed affair with Winnie. Meanwhile, David receives his toughest assignment from Zero yet – going after a corrupt police officer, Inspector Leong. Ironically, Inspector Leong is the in charge of his case, so hunter becomes the hunted and vice versa.

David personal and professional life fall apart as a result of the Zero affair – in addition to tensions at home, he is asked to leave his job when evidence surfaces that he might have fixed the company accounts. In the meantime, Zero is putting pressure on him to confront Inspector Leong and bring him to justice. The more David rejects Winnie, the more she comes after him. When Julie can no longer bear it, she sets out to confront Winnie in a showdown.