When Detective Superintendent Boyd encounters a woman unable to accept the explanation of her father's death, he takes on the case.

A newly discovered note seems to set the seal on a suicide verdict, but when Boyd and the team exhume Perry Coleman's body, DNA tests reveal some disturbing facts.

When a skeleton is discovered in a Church crypt Boyd and his team suspect it was never meant to be found. The team interview the local community and awaken deeply hidden family secrets that force Boyd to look at his own past.

Frankie learns that the skeleton and a priest may be related as both show symptoms of Huntington's Chorea. The hunt is on for the killer and the victim's mother. Meanwhile, the investigation opens old wounds for Boyd, still in despair over the disappearance of his own son.

The Cold Case Squad are called in when new evidence emerges in the case of a woman who was convicted of double murder on the basis of her own confession 25 years ago.

Boyd now doubts that Annie Keel really committed the murders, so why did she confess and what, and what happened to her son who was present on the night in 1975 when the crimes took place?

When the body of a policewoman missing for a year is pulled from the Thames, Boyd and the team discover that she was being followed by two stalkers.

Boyd and the team track down murdered police officer Debbie's married lover, but he denies killing her. Meanwhile, stalker Christopher Redford is ready to confess to the murder, but Grace is not convinced he's the guilty man.