Time is running out for Boyd as he fights for justice against a powerful adversary.

As Ben goes missing, Boyd and his team try to force the truth out of a confused David. Boyd grows increasingly close to Sarah, and Stella travels to Poland to investigate the true story.

Boyd investigates the disappearance of 16 homeless boys from Waterloo Bridge in the 1980s.

After shooting an unarmed man in the raid on the nursery, Mel is suspended from the case pending an inquiry. Grace and Boyd, meanwhile, have more questions for Roper—but the doctor's in no position to answer them.

As DNA evidence from an old case of Spencer's (while he was working for the Atomic Energy Constabulary) is re-examined it appears that the wrong man was sent to jail. Someone tries to coverup the new evidence, causing all eyes to turn to Spencer.

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?

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 and eventually confront the unfathomable evil lurking within the heart of this sad, unfortunate family.

Grace is haunted by an old case that she assisted on at the beginning of her career when she is asked to give evidence at the assailant's appeal hearing.

Someone possibly copying the past crimes begins harassing Grace about her testimony against Tony Greene. If she doesn't admit that she was wrong about him, the assailant promises to murder the victim he/she is holding hostage.

As DNA evidence from an old case of Spencer's (while he was working for the Atomic Energy Constabulary) is re-examined it appears that the wrong man was sent to jail. Someone tries to coverup the new evidence, causing all eyes to turn to Spencer.

Grace is not convinced that the stalker who confessed to the murder is truly guilty. But who really killed the police officer? Was it possibly the stalker, her ex-husband, or the married father of her unborn baby?

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

Boyd and his team uncover the awful truth behind the walls of the psychiatric hospital.

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.After the empty and abandoned car of banker Donald Rees is discovered threee years after he went missing, Boyd decides to take on the case in an effort help the man's family find some closure with their lives.

Is the Second World War the linking factor? The team must find the next possible victim but no-one knows where he is.

Two five-year-old twins are taken from their home in Notting Hill Carnival and a nationwide search is launched, but they are not found. Thirteen years later, one of the twins, Jason, is admitted to hospital after a traffic accident. The hunt now begins to establish where his sister, Cindy might be and if she is still alive.

Boyd and the team continue to investigate the arson case and the other two other possible crime connections to 'The Shepherd'. Will the team discover this person's true identity or will it all turn out to be a part of the imagination of a mentally ill woman?

A criminal is about to be released, the team is sure he is a serial killer. They enter in a race against the clock to prove their suspicions and prevent his upcoming release.

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.

An old adversary of Boyd's asks him to investigate two deaths at her psychiatric hospital.

After a woman is discovered stabbed in the eyes and incinerated in her car she is identified as Claire Somers, a neglected child who was taken into care, then later kidnapped in 1986 at the age of seven. Robert Fenchurch had his eyes stabbed out on the night Claire was kidnapped as her abductor fled the scene. The team soon find out that Claire had snatched 15-year-old Abigail Harding, who was found locked in a hotel room.

When the corpse of a well-known police woman who went missing a year earlier is found floating in the Thames, Boyd and his team of investigators try to track down who murdered her and her unborn child.

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 postliminary inquiries into Harry Newman's past and the identities of the possible twelve murder victims uncover a connection to the infamous trial and execution of a well known gangster.

Twelve years after Joanna Gold famously disappeared in broad daylight on Hampstead Heath, the dress she was wearing is found in a lock-up. The team begin the hunt for her killer.