The team tracks down Debbie's married lover, but he denies killing her. Meanwhile, stalker Chris Redford is ready to confess, but Grace is not convinced he's the guilty man.

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.

Who else was present at the time of the murders? Boyd suspects Keel is covering for someone and forces her to revisit that fateful night in 1975.

25 years ago, Annie Keel confessed to the murder of her husband and her neighbour's son. When new evidence calls her confession into doubt, Boyd and the team must dig deeper.

The case drives Boyd to despair as it opens old wounds, whilst the rest of the team learns that the skeleton and a priest at the church may be related.

Renovations at a Catholic church reveal a skull buried within the concrete for over 20 years, bringing the team into contact with the church's community as they investigate.

New evidence points to suicide but, when Boyd and the team exhume Perry Coleman's body, DNA tests reveal some disturbing facts that call this into question.

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

The team exhume the first victim to find vital clues with new DNA techniques. But, just when Boyd thinks he is getting closer, he finds he is facing one smokescreen after another. The team is at breaking point in a nail-biting race against the clock to trap the killer and solve the case.

DCI Boyd's first task as head of the new Cold Case Squad is to find the killer of a schoolgirl murdered five years ago. But as they begin work, they inadvertently inspire the killer to strike again. And, unbeknown to Boyd and his team, the murderer has a hidden agenda - to take revenge.