Boyd has to break in a new team member of equal rank, detective Superintendent Sarah Cavendish, a high-flyer recently grounded by a hushed-up failed operation.
Boyd is convinced that the missing Donald is not a murderer, and pushes his team to try to make sense of all the vague connections in the case.
When the Cold Case squad learn that a recently murdered woman is Claire Somers, who as a seven year-old girl was abducted from a care home 25 years ago, they unveil a shocking portrait of life in the 1980s care system.
The investigation into Claire Somers' death has seemingly unleashed a predator straight from the darkest childhood nightmare. But are they looking for a monstrous child-stealer, or misguided saviours?
The Cold Case team investigate the murder of notorious Falklands' veteran-turned-peace activist Piers Kennedy, rumoured by conspiracy theorists to have been killed by the state.
As Boyd and his team burrow deep into the world of early 80s British national security, they uncover duplicity and sabotage that goes to the heart of government today, and that puts Grace in mortal danger.
A missing medical student's DNA matches an unidentified corpse found tortured and drowned years before, Boyd suspects a cover-up.
When a missing medical student's DNA matches with that of an unidentified corpse found tortured and drowned years before, Boyd suspects a cover-up.
Boyd is being moved out of the Cold Case Unit, but first he decides to take on the unsolved mystery of 16 homeless boys from Waterloo Bridge who disappeared in the 1980s.
There's growing concern amongst the team over Sarah's disappearance, and time is running out for Boyd as he fights his final battle for justice against a powerful adversary. Will he prevail?