A parent's worst fear is realised when seven-year-old Libby Hallforth goes missing at a funfair; no witnesses, no leads, and no trace. Months later, human remains are found, but they're too old to be Libby. It's the tip of a gruesome iceberg - bodies, buried in pairs, carefully laid to rest in a ritualistic manner. For DI Jake Porter and DS Nick Styles, the trail for Libby is cold, and everyone is a suspect.

When crusading journalist Lydia Wright is sent a video of an apparent murder on a London train, she thinks she’s found the story to revive her career. But she can’t find a victim, much less the killers, and the only witness has disappeared. Wary she’s fallen for fake news, she begins to doubt her instincts - until a sinister call suggests that she’s not the only one interested in the crime. Michael Stringer deals in information - and doesn’t care which side of the law he finds himself on.

DCI Matilda Darke has returned to work after a nine-month absence. A shadow of her former self, she is tasked with reopening a cold case: the terrifyingly brutal murders of Miranda and Stefan Harkness. The only witness was their 11-year-old son, Jonathan, who was too deeply traumatised to speak a word. Then a dead body is discovered, and the investigation leads back to Matilda's case. Suddenly the past and present converge, and it seems a killer may have come back for more.... 

Police officer Sebastian Clifford never planned on becoming a private investigator. But when a scandal leads to the disbandment of his London based special squad, he finds himself out of a job. That is, until his cousin calls on him to investigate her husband’s high-profile death, and prove that it wasn’t a suicide. Clifford’s reluctant to get involved, but the more he digs, the more evidence he finds. With his ability to remember everything he's ever seen, he's the perfect person to untangle the layers of deceit.

Was the biggest case of his career the worst mistake he ever made? Ten years ago, DCI Jack Logan stopped the serial child-killer dubbed "Mister Whisper", earning himself a commendation, a drinking problem, and a broken marriage in the process...When another child disappears a hundred miles north in the Highlands, Jack is sent to lead the investigation and bring the boy home. But as similarities between the two cases grow, could it be that Jack caught the wrong man all those years ago?

A serial killer is burning people alive in the Lake District's prehistoric stone circles. He leaves no clues, and the police are helpless. When his name is found carved into the charred remains of the third victim, disgraced detective Washington Poe is brought back from suspension and into an investigation he wants no part of. He is reluctantly partnered with brilliant but socially awkward civilian analyst Tilly Bradshaw, and the mismatched pair uncover a trail that only he is meant to see. The elusive killer has a plan, and for some reason Poe is part of it.

A young woman is brutally attacked on her way home. It looks like she was the victim of a jilted—and twisted—ex-lover. But then two more women, also engaged to be married, are found dead. The press call the killer the "Surrey Stalker". And there’s a stack of similar cold case files. The pressure is on for young, ambitious DI Rob Miller. But with all the time he’s spending at the office, Rob’s also running a fine line trying to keep his fiancée, Yvette, onside as they try to plan their wedding.

Sixteen-year-old Robert arrives home late. Without a word to his dad, he goes up to his bedroom. Robert is never seen alive again. A body is soon found on the coast of the Scottish Highlands. Detective Inspector Monica Kennedy stands by the victim in this starkly beautiful and remote landscape. Instinct tells her the case won’t begin and end with this one death. Meanwhile, Inverness-based social worker Michael Bach is worried about one of his clients whose last correspondence was a single ambiguous text message; Nichol Morgan has been missing for seven days....

Mary O'Connor has been keeping a vigil for her first love for the past seven years. Every evening without fail, Mary arrives at Ealing Broadway station and sets herself up among the commuters. In her hands Mary holds a sign which bears the words 'Come Home Jim'. Call her mad, call her a nuisance, call her a drain on society - Mary isn't going anywhere. That is, until an unexpected call turns her world on its head. In spite of all her efforts, Mary can no longer find the strength to hold herself together.

With a glittering career, spanning several decades representing the privileged and the wealthy, behind him the focus of the investigation inevitably turns toward cases and clients past and present, but was his death linked to his work or is there another, darker and far more sinister motive at play? No matter how successful, privileged or elevated in society one person can be, one universal rule applies; we all bleed the same.

After the body of a missing woman is discovered in a shallow grave, Detective Inspector Harry Powell steps in to lead the hunt for the killer. But when his investigation brings him face-to-face with an old case in his career, he begins to fear that a fatal mistake from his past may have left a dangerous criminal roaming free. While the Murder Squad are occupied by their new case, a new arrival sends ripples throughout the ranks. On the outside, Detective Constable Dane Hoopman appears to be like any other officer, but under the surface, does a dark secret lie in wait?

Recovering addict Eric Johnstone is turning his life around. Then one small moment changes everything, and Eric is sent down a dark path that leads him towards a life-or-death decision. Just months after he took a job at the retirement village in Point Imlay, the tide goes out on the town’s oyster beds, and Eric’s body is revealed. When Senior Detective John Darken’s business card is discovered in Eric’s pocket, J.D. transfers to Point Imlay to help with the investigation. 

A family is gunned down in the snow, but one of the children survives. Three years on, that child takes revenge, and the Snow Killer is born. But then, nothing - no further crimes are committed, and the case goes cold. 50 years later, has the urge to kill been reawakened? As murder follows murder, the detective team tasked with solving the crimes struggle with the lack of leads. It’s a race against time and the weather - each time it snows, another person dies.

Lexi Ryan is being targeted and can't work out why. She's escaped the troubled town of Warner with her beautiful partner, former Det. Chief Inspector Helen Taylor, and is looking for a quieter life. Instead, she's faced with an attempted hit-and-run and mailbox tampering. Helen, meanwhile, is finding it hard coming to terms with civilian status. But once a cop, always a cop, and she uses her old skills to play bodyguard to Lexi and kick over the clues.

When the chief suspect in the notorious "peekaboo cop killer" case blew himself up, almost taking lead investigator DCI  Duncan Bone with him, the psychologically damaged detective thought his days on the force were over. But, when another PC is abducted and murdered in the same deranged peekaboo fashion, Bone is persuaded to return to lead the new investigation.