Tony and Alex investigate the violent murder of a young prostitute, but find that their prime suspect for the murder was incarcerated in a high security psychiatric unit at the time. Suspecting a link to an ongoing Vice operation, Alex teams up with squad detectives Shields & Mulligan. But when the next target becomes one of their own, Tony is forced to find the link between the killer and the outside world.

Tony comes under scrutiny from both the police and the media when it is revealed that he made a serious error of judgement in a case over ten years ago, which resulted in the conviction of an innocent man for a series of murders. As each and every one of his cases is torn apart, he realises he must find the real killer in order to prevent him from losing the one thing he holds dear.