There's growing concern over Sarah's disappearance, and time is running out for Boyd as he fights for justice against a powerful adversary.

Boyd is being moved out of the Cold Case Unit, but first takes on the mystery of 16 homeless boys from Waterloo Bridge who disappeared in the 1980s.

Boyd needs Sarah's counter-terrorism expertise to help expose the state's involvement in Barclay's death, but the case amplifies her self-doubt.

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.

The team uncover duplicity and sabotage that goes to the heart of government, and that puts Grace in mortal danger.

The Cold Case team investigate the murder of Falklands' veteran-turned-peace activist Piers Kennedy, rumoured to have been killed by the state.

The investigation into Claire Somers' death has seemingly unleashed a predator straight from the darkest childhood nightmare, but is all as it seems?

A murdered woman transpires to have been abducted from a care home as a child.

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.

Boyd has to break in a new team member of equal rank, and the team investigate the mystery of a missing banker to help his family find closure.