Boyd vows to track down the ring of war criminals, all of whom are now living and working in the UK

The plot thickens as Rivelli and then Harris confess to the three cold case murders. Boyd remains suspicious though - who was the real murderer and what has Jensen got to do with it all?

Boyd and the team take on the task of infiltrating the dark underworld of London's gangland crime families when Harry Newman makes a deathbed confession to 12 "unauthorised killings". Dr Grace Foley is intrigued by this strange expression but Boyd and the rest of the team are tempted to dismiss it as the meanderings of a dying man. Until, that is, forensic psychologist Frankie Wharton discovers that Newman did not die of natural causes, but has been murdered. They soon realise there's a lot more to Newman than they imagined. Added to all that, there's a link to a famous fifties trial in which a gangster was hanged for killing two policemen.

The failed suicide of a women called Gemma who has been raped 12 years ago, when she was just a girl by two men, causes Boyd and his team to re-open the investigation. But as the previous investigation went nowhere there aren't any leads left to start from.

Boyd and his team struggle to find the truth behind the murder of a prominent Home Office adviser, when a petty criminal is acquitted of the crime. Once a prominent feminist activist, victim Katherine Reed had attacked the establishment at every opportunity, only to later switch sides. Boyd's progress on the case is hampered not only by a Home Office audit, which means the team will be shadowed throughout, but also by the fact that the original investigation was conducted by one of his old flames.

Boyd receives an anonymous package in the post – a Nazi ceremonial dagger. Attached to it is a Cold Case number, linking it to the unsolved murder of a young girl in May 1945. It seems that Mel had been working on the case before her death, what does this mean for the Cold Case Team?

After they get a tip off in an anonymous e-mail,the team head to a waste ground in east London, where they find the remains of a right-wing fascist activist.

When a woman defends her daughter from a mugger, it sets into motion a chain of events that places herself and her children in mortal danger.

When they do some digging into the man's past, they discover the deceased was not who he claimed to be, but in fact he had a hidden agenda of his own.

When a convicted killer is cleared at appeal for the murder of his adoptive father ten years previously, Boyd is not convinced that the man is innocent. But the only way to find out is to track down the rest of the family - and with a big inheritance at stake, both parties appear to have a lot to hide..