DI Gravel and his daughter, Emily, are oblivious to the terrible danger she is in when she accepts a job working for the solicitor Charles Turner. Meanwhile, Gravel is on the hunt for a serial killer. And when Emily becomes the killer’s latest obsession, the murderer will stop at nothing to make his grotesque fantasies reality. But as further bodies are discovered, the killer seeks to befriend DI Gravel and misdirect his investigation. How can you catch a killer who is hiding in plain sight? Can DI Gravel and Emily come away from this case with both their lives intact?

When nineteen-year-old university student Emma goes missing, Detective Inspector Gareth Gravel is called in. But what is a simple missing person case soon turns into something much darker as Gravel’s inquiries lead him to the graves of five young women - each of whom looks just like Emma. With a serial killer on the loose and his latest victim already in his control, can the police find Emma in time? Or will Emma have to save herself?

DS Rakesh Siyal is an idealist. Frustrated as an Edinburgh human rights lawyer, he joins the police, determined to solve the problems he sees with the criminal justice system from the inside, rather than out. His first day as a cop sees him sent down to Galashiels in the Scottish Borders, where he’s given a simple task – return a suspect to Glasgow to face justice.

Former detective sergeant Norman Norman’s retirement is boring him to tears. So when he’s asked to assist an upcoming female DI and mentor a new team of misfits in a sleepy Welsh coastal town, he jumps at the opportunity. But the training has barely begun when a woman’s corpse washes up on the sand. With no reports of missing persons, DS Norman is stumped...until the post-mortem reveals a shocking hint to the culprit being local. But with a growing list of suspects who all have alibis, the experienced cop and his fledgling team’s first case could be their last.

Detective Chief Inspector Beth Fellows is thrown into the biggest case of her career: the brutal murder of Rose Danes. She quickly realizes Rose’s murder is linked to a cold case she investigated two years previously. The victim, 14-year-old Celine Wilson, survived but now languishes in a coma. Both girls were branded with the image of a raven. The only lead is a vague description and a first name, Simon.

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.

A brutal double murder on a Norfolk beach horrifies the town of Cromer. The way the victims died is chilling and so Norfolk’s Major Investigation Team task DS Ashley Knight to manage the case. It soon becomes clear that the murders were carefully planned and the finger of suspicion points to an organised crime gang, but as the evidence mounts, a far more sinister theory emerges.

Five years ago, DCI John Lomond led the search for notorious Glasgow child-killer ‘The Sandman', until personal tragedy forced him off the case. In Lomond's absence, the killer was never found. Now, with nothing but work left in his life, Lomond remains obsessed with the case–despite the nightmares it brings. When a child is abducted in similar Sandman fashion from an affluent Glasgow suburb, Lomond is brought in to find them before it's too late.

A sinking boat is spotted off the South Coast. Waiting onboard is a grisly discovery. DCI Boyd, recently relocated from London to Hastings, is now with the East Sussex CID, and his first case is that of a local businessman and his new young wife, missing in the English Channel. All that remains of them is a grim scene aboard their half-submerged yacht and a digital trail of clues that could put Boyd and his daughter, Emma, in danger. 

Starting a new life in Snowdonia was always DI Ruth Hunter's dream. Until a twisted killer turned it into her worst nightmare. Detective Inspector Ruth Hunter lives with the pain of her partner’s mysterious and unsolved disappearance. About to hit 50, the veteran police officer trades in the crime-ridden streets of London for a more peaceful life in rural North Wales. But Ruth has barely settled into her new position in North Wales Police, when the body of a brutally murdered woman is discovered...with strange symbols carved into her skin.

The Mailer family are oblivious to the terrible danger that enters their lives when seven-year-old Anthony is referred to the child guidance service by the family GP following the breakdown of his parents' marriage. Fifty-eight year old Dr. David Galbraith, a sadistic, predatory paedophile employed as a consultant child psychiatrist, has already murdered one child in the soundproofed cellar below the South Wales Georgian townhouse he shares with his wife and two young daughters. Anthony becomes Galbraith's latest obsession and he will stop at nothing to make his grotesque fantasies reality.

Detective Norman is out of retirement and back on the beat in a rainy Welsh seaside town. Llangwelli might be short on sunshine, but it's certainly not short on murders . . . Norman is a bit old-fashioned, but he's also willing to learn from his band of misfit recruits. He's asked to mentor a team of misfits in a sleepy Welsh seaside town. But training has barely begun when a woman's body washes up on the beach at Llangwelli.

When a body is found on a lonely cliff top path, the angelic face of a murdered teenager lies facing the rising sun. Strangled by the hands of an unknown killer, it falls to DI Tom Janssen and his fledgling team to find out how she came to be there. Destined for a career in medicine, one to rival that of her parents, Holly Bettany’s future was as bright as it had been privileged. Seemingly, all that could threaten this promising teenager’s life was Holly herself.

A woman has been murdered and mutilated in her own home, with her liver cut out and a message left within it. Tasked with leading the case, DI Tudor Manx identifies several suspects, including the victim’s estranged husband. But all trails run cold. Then, another victim dies—and from the modus operandi. It seems that North Wales Police are dealing with a serial killer. But who would target the inhabitants of such a peaceful island?

Still grieving from the tragic death of her colleague, DCI Emma Gardner continues to blame herself and is struggling to focus. So, when she is seconded to the wilds of Yorkshire, Emma hopes she’ll be able to get her mind back on the job, doing what she does best - putting killers behind bars. But when she is immediately thrown into another violent murder, Emma has no time to rest. Desperate to get answers and find the killer, Emma needs all the help she can. But her new partner, DI Paul Riddick, has demons and issues of his own.