《黑暗边缘》根据1985年BBC六小时的迷你剧集改编。波士顿警局的凶杀案侦探托马斯·克莱文(梅尔·吉布森 Mel Gibson 饰),作为一名单亲父亲他对24岁的女儿疼爱有加,但天有不测风云,一天女儿被人杀死在自己家门前的台阶上。托马斯认为杀手真正的目标是自己,固执的他一头扎进这个案子中,但随着调查的深入他发现女儿的被害其实另有隐情,在案件背后是整个政府系统的腐败。Thomas Craven is a detective who has spent years working the streets of Boston. When his own daughter is killed outside his own home, Craven soon realizes that her death is only one piece of an intriguing puzzle filled with corruption and conspiracy, and it falls to him to discover who is behind the crime.