Although the case was deemed cold at the time, Boyd's second investigation leads to a surprise turn of events, spurring the killer out of hiding, and forcing him to abduct a second girl, Jodie Whitemore.
Boyd has Alice Miller's body exhumed, hoping that new DNA tests may reveal the killer's true identity, and provide clues as to the location of the missing girl, Jodie.
When a young woman, Marina, sets alight an abandoned car in the middle of a busy street, and takes photographs of it as it burns, Boyd is forced to pin her to the ground, attempting to shield her from the possible explosion.
However, an unusual piece of evidence – a message in Braille buried with the corpse, turns out to be a passage from one of St. Paul's letters to the Corinthians and proves to be a vital clue in identifying both the victim, and the killer.
New evidence comes to light in the case of Annie Keel, a woman who was tried and convicted twenty-five years ago of a double murder when both her husband and a neighbour's son were killed in extreme circumstances.
When the corpse of well-known police woman Debbie Britten, who disappeared a year earlier, is found floating in a golf bag in the River Thames, Boyd and the team try to discover who would have the motive to kill both her and her unborn child.
The team are forced to enlist the help of a psychotic serial killer named Thomas Rice, when the one woman who escaped death at his hands, the cool and poised Dr. Clare Delaney, gets a dreadful reminder of her past ordeal and a fearful shock when a playing card is flung at her car windscreen as she sets off to make a house call on a wet, windy, dark night.
Boyd and the team take on the task of infiltrating the dark underworld of London's gangland crime families when small-time gangster Harry Newman makes a deathbed confession to twelve "unauthorised killings".
Boyd's progress on the case is hampered not only by a Home Office audit, which means the team will be shadowed throughout, but also by the fact that the original investigation was conducted by one of his old flames, with whom he is desperate to rekindle a relationship.
As the team continue with their investigation at Whitehall, they quickly discover the atmosphere to be very dark and secretive, and soon realise that only cunning tactics will allow them to flush out Katherine's killer, and eliminate those who simply slept with her in an attempt to get her pregnant.
Twelve years after sixteen-year-old Joanna Gold famously disappeared in broad daylight on Hampstead Heath, the dress she was wearing is found in a lock-up garage owned by one of her old friends.
When Mark Lovell, a man convicted of murdering his adoptive father ten years previously, is cleared on appeal, Boyd is not convinced that he is innocent, and decides to re-open the case.
Realizing that his prime suspect may be under the watchful eye of another police officer and his team, Boyd decides to use the brothers against each other, in order to uncover evidence, which traps the killer and secures a conviction.
Just as Boyd believes he has cracked the case, the gangster responsible for the bodies behind the walls decides it's time to avenge old wounds, and the unearthing of past events provokes more murders and an international turf war between old rivals.
Boyd and the team are tasked with investigating the unsolved murder of George Western, a man found with a nine-inch nail in his skull in 1948, when his grandson, Adam, discovers new "evidence" which spurs the police into re-opening the case.
As the team link the twins' disappearance to Dr. Roper, the man driving the car, which hit Jason, they find him dead, after being stabbed repeatedly with a kitchen knife in his own home.
As the latest victim has a brother linked to organised crime, DSI Andy Bulmer and his team from NCIS are all over the case, and suspect that Barac's death may be related to his activities rather than the work of a serial killer.
A mummified body found on a derelict aeroplane leads Boyd and the team to a person already convicted of committing a similar crime, and Spence goes undercover in a bid to understand his motives.
Featuring Toby Stephens as Dr. Nick Henderson, Ronan Vibert as Dr. Jonathan Lynch, Ayesha Dharker as Mary Sharman and Frank Harper as John Tate.
Spencer, the only one who was not inside the building when the gas bomb exploded, is then left to carry on the investigation on his own, in the face of overwhelming odds and opposition from far higher circles of power.
The team are called to investigate when escaped psychiatric patient Daniel Lennon directs a family to unearth a forty-year-old male corpse buried beneath their Hampstead garden.
Featuring Rupert Graves as John Garret, Nicholas Farrell as Colonel Douglas Malham, Jamie Sives as Corporal Robert Lomax, Holliday Grainger as Nicola Bennet, Lorraine Stanley as Susan Carlyle, George Rainsford as Luke Boyd and Stefan Kalipha as Mushrat Badawi.
The discovery of a corpse in a disused tunnel beside a motorway leads the team to investigate the twelve-year-old murder of Christopher Deardon, who disappeared in 1996 after supposedly leaving the country for an international conference, but actually never left, and instead vanished into thin air.
However, the two men she is working with lose their cool when Boyd and the team come hot on their tail and use Anna as bait to allow themselves some time, and get to their real target – a North London cafe owner whose activities during the Balkans War are somewhat questionable.
Boyd unravels a plot, which involves the woman's business partner, attempting to reclaim six million pounds he lost in a dodgy stock deal, and three Turkish men, who originally invested the money and now want it back.
When crime scene examiners find a card in her car with the words 'find them' written on it, and Boyd's phone number on the other side, he decides to re-open the case, much to the dismay of an unhappy Spence.
With the horrific discovery of a live body farm, and discovering that Briony was implicated in the entire operation, Boyd realises that Devlin killed her after she refused to continue picking victims for him.
Boyd is forced to break-in a new member of the team, Detective Superintendent Sarah Cavendish, an officer of equal rank whose high-flying activities were recently grounded by a hushed-up failed operation.
When a charred body from the scene of a car fire is discovered to be that of Claire Somers, a woman who disappeared from her care home twenty five-years ago when she was still a 7-year-old girl, the team investigate.
As the investigation into how or when the girl was kidnapped gets underway, the team discover that shortly before her death, Claire visited a local private clinic in order to obtain some pills to help her with depression.