He's your perfect date. You're his next victim. When the tortured body of a young woman is found in a dumpster, her eyes swollen shut and her clothes soaked with blood, detective Erika Foster is one of the first at the crime scene. The trouble is, this time it's not her case.

When a battered suitcase containing the dismembered body of a young man washes up on the shore of the river Thames, Detective Erika Foster is shocked. She's worked on some terrifying cases but never seen anything like this before. As Erika and her team set to work, she makes the link with another victim - the body of a young woman dumped in an identical suitcase two weeks ago. Erika quickly realizes she's on the trail of a serial killer who's already made their next move.

In the dead of a swelteringly hot summer's night, Detective Erika Foster is called to a murder scene. The victim, a doctor, is found suffocated in bed. His wrists are bound and his eyes bulging through a clear plastic bag tied tight over his head. A few days later, another victim is found dead in exactly the same circumstances. As Erika and her team start digging deeper, they discover a calculated serial killer - stalking their victims before choosing the right moment to strike.

On a cold icy morning, a mother wakes to find her daughter’s blood-soaked body frozen to the road. Who would carry out such a horrific killing on the victim’s doorstep? Straight off her last harrowing case, Detective Erika Foster is feeling fragile but determined to lead the investigation. As she sets to work, she finds reports of assaults in the same quiet South London suburb where the woman was killed. One chilling detail links them to the murder victim - they were all attacked by a figure in black wearing a gas mask.

When a young boy discovers the body of a woman beneath a thick sheet of ice in a South London park, Detective Erika Foster is called in to lead the murder investigation. The victim, a beautiful young socialite, appeared to have the perfect life. Yet when Erika begins to dig deeper, she starts to connect the dots between the murder and the killings of three prostitutes, all found strangled, hands bound, and dumped in water around London.

Kate Marshall was a promising young police detective when she caught the notorious Nine Elms serial killer. But her greatest victory suddenly turned into a nightmare. Traumatized, betrayed, and publicly vilified for the shocking circumstances surrounding the cannibal murder case, Kate could only watch as her career ended in scandal. Fifteen years after those catastrophic events, Kate is still haunted by the unquiet ghosts of her troubled past. Now a lecturer at a small coastal English university, she finally has a chance to face them.

Kate Marshall’s fledgling PI agency takes off when she and her partner, Tristan Harper, are hired for their first big case. It’s a cold one. Twelve years before, journalist Joanna Duncan disappeared after exposing a political scandal. Most people have moved on. Joanna’s mother refuses to let go. When Kate and Tristan gain access to the original case files, they revisit the same suspects and follow the same leads - but not to the same dead ends. Among Joanna’s personal effects, Kate discovers the names of two young men who also vanished without a trace.

Criminology academic Kate Marshall is on a scuba jaunt with her son when they dive toward a shocking discovery: the body of a teenage boy entangled below the surface of the Shadow Sands reservoir. The detective chief inspector’s too-quick narrative of a tragic drowning doesn’t add up, and when Kate follows the evidence, it leads to a darker discovery. 

The Fens are burning, and Detective Nikki Galena faces a cat-and-mouse battle with a killer arsonist. Someone is lighting fires. First they target homes and businesses, but then a body is found at one of the crime scenes. More fires are lit. And at each one a single person dies. But the victims have led spotless lives, and apparently there's no connection between them. Meanwhile, the town is facing a very peculiar threat from a group of sinister Satanists led by a charismatic businessman. Who is burning with anger, and can Nikki stop them before anyone else dies? 

One moonlit night, the bodies of two young people are discovered lying entwined on a blanket in the woods. The young man is clutching a red rose. It appears to be a lovers' suicide pact.... Until Detective Nikki Galena and DS Joseph Easter look more closely. Romeo and Juliet, as they decide to call them, were murdered somewhere else and brought to the woods. But why? Then another young couple are found dead, again beautifully posed as lovers. 

Detective Joseph Easter's daughter discovers a cottage hidden in some trees on a large fenland farm. Someone has been living there. The farm owner's wife has been receiving sinister pagan artifacts, including a witch's knife. Are they some sort of warning or message? Joseph and his daughter search the cottage and find an old satchel. Inside are photos of a beautiful girl, Jennifer Cowley. She went missing 15 years ago. She'd been stalked by a young man, who was convicted of her murder, even though her body was never found.

Revellers are flocking into Greenborough for the yearly Dark Greenborough Festival, a three-day event celebrating local folklore, superstition, and the darker side of life. What the public doesn't know is that there has been a warning sent to the police, saying that Greenborough will be a very dangerous place this year. The anonymous letter ends with the Latin phrase, Mors certa, hora incerta: Death is certain, the hour uncertain.  

DI Nikki Galena gets a series of anonymous calls. She is told the place, time, and who will die. But the messages are in a secret language used only by villains. Nikki and her team must decode the riddles and work out where the threats are coming from.

In the midst of a rock festival, a charity worker is sliced across the stomach. He dies minutes later. In a crowd of thousands, no one saw his attacker. The following week, the body of a primary school teacher is found in a Dumpster in an Edinburgh alley, strangled with her own woolen scarf. DI Ava Turner and DI Luc Callanach have no motive and no leads - until around the city, graffitied on buildings, words appear describing each victim.

When silence falls, who will hear their cries? The body of a young girl is found dumped on the roadside on the outskirts of Edinburgh. When pathologists examine the remains, they make a gruesome discovery: the outline of a doll carved into the victim’s skin. DCI Ava Turner and DI Luc Callanach are struggling to find leads in the case until a doll made of skin is found nestled beside an abandoned baby. After another young woman is found butchered, Luc and Ava realise the babydoll killer is playing a horrifying game. And it’s only a matter of time before he strikes again.