John Doe, a seemingly average man played by Jamie Bamber, embarks on a personal mission of justice after experiencing the tragic loss of his wife and nine-year-old daughter. Consumed by grief and anger, he chooses to take the law into his own hands, systematically targeting and killing criminals such as pedophiles, rapists, and drug dealers. His brutal acts are meticulously recorded on video and shared with the media, sparking widespread debate about morality, justice, and vengeance.
Initially, the mainstream media edit and censor John's videos, showing only the executions without context. In response, he hands over uncut footage to a smaller media outlet, which broadcasts the raw, unedited versions online. This sparks a movement called "Speak for the Dead," which aims to publicize the crimes and perceived injustices committed by the victims of crime. Supporters argue that John’s actions serve as a form of punishment for those who have escaped traditional justice, especially as some offenders reoffend after serving their sentences.
The story intensifies at a nightclub where chaos erupts after two bouncers assault and kill a teenage boy, whose death is then covered up through bribery by the club owner. In retaliation, John uses a homemade cyanide patch to kill one of the bouncers following an incident where he harasses a woman in an elevator. This event inspires others to act, and a ripple effect begins with a series of violent vigilante acts. Three teenage boys try to avenge the boy's death by attacking the other bouncer; however, due to the bouncer's heightened alertness after his brother’s death, he fatally wounds all three.
This aggressive series of events eventually leads to an ambush, where the bouncer is overwhelmed and killed by a larger group of vigilantes. One of the teenage boys involved was secretly a patient of John Doe, raising questions about whether the vigilante's actions were influenced or manipulated by him. Later, John confronts a criminal named Fletcher Humphrys, who murdered his wife and daughter. This confrontation is broadcast live, with John revealing himself and offering Adam, played by a criminal, a chance to plead his case.
Adam attempts to justify his crimes by claiming he was driven by an abusive past, but he quickly admits his remorse is feigned, prompting John to execute him on camera. Following this, John Doe surrenders to authorities and is tried for thirty-three murders. During his trial, he is interviewed in jail by journalist Ken Rutherford, discussing his motives and the movement he inspired. During the interview, John appears to swallow a cyanide capsule hidden inside a fake tooth, seemingly ending his life. However, in a chilling reversal, it is revealed that he had planned this and kills Rutherford in the process, having chosen him deliberately because of the journalist’s own brutal past, culminating in the broadcast of Rutherford’s murder as well.
Despite the court’s verdict, the story takes a dramatic turn as John Doe's followers launch an attack on the courthouse, setting off a bomb and firing into the crowd to free him. He escapes amidst the chaos, leaving his fate uncertain and the world embroiled in questions of justice, morality, and vigilantism.
Throughout the film, Lachy Hulme and Paul O'Brien portray key figures such as the judge and the police officers involved in the unfolding chaos. The film offers a complex exploration of themes like morality, revenge, and the impact of vigilantism, leaving viewers pondering whether John Doe is a hero, a villain, or something far more ambiguous.
