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.

When Detective Erika Foster receives a tip-off that key evidence for a major narcotics case was stashed in a disused quarry on the outskirts of London, she orders for it to be searched. From the thick sludge the drugs are recovered, but so is the skeleton of a young child. The remains are quickly identified as seven-year-old Jessica Collins. The missing girl who made headline news 26 years ago.

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.

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.

Detective Erika Foster is on a late-night walk near her new house in Blackheath when she stumbles upon the brutal murder of Vicky Clarke, a true-crime podcaster. Erika is assigned to the case and discovers that Vicky had been working on a new podcast episode about a sexual predator who preys on young female students around South London, staking out his victims in their halls of residence before breaking in at the dead of night.

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.

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. 

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.

When everyone is sleeping, he comes into their houses. He takes one thing. A photo of their child. A sinister thief on a power trip or something even darker and more sinister? Detectives Jackman and Evans find themselves on the hunt for a highly unusual burglar who seemingly only steals photographs. But then, late one night, an elderly woman falls to her death after seeing someone in her home. Did she really fall, or was she murdered? 

Evie Cormac was found at a murder scene six years ago, hiding in a secret room. She has never revealed her real name, why she was in that house, or what she saw. Forensic psychologist Cyrus Haven wants to help the traumatised teenager. He thinks unravelling Evie's secrets will free her from the past. But he has no idea what he's about to unleash....

When she's not digging up bones or other ancient objects, Ruth Galloway lectures at the University of North Norfolk. She lives happily alone in a remote place called Saltmarsh overlooking the North Sea and, for company; she has her cats Flint and Sparky, and Radio 4. When a child's bones are found in the marshes near an ancient site that Ruth worked on ten years earlier, Ruth is asked to date them.

When a woman's body is discovered in a cathedral and hours later a young man is found hanging from a tree outside his home, Detective Lottie Parker is called in to lead the investigation. Both bodies have the same distinctive tattoo clumsily inscribed on their legs. It's clear the pair are connected, but how? The trail leads Lottie to St Angela's, a former children's home, with a dark connection to her own family history. Suddenly the case just got personal.

In the beautiful gardens of Shelley House a shocking discovery is made. A blackened hand dangles over the side of a wheelbarrow. The horrific scent of burnt flesh lingers in the air. Detectives Nikki Galena and Joseph Easter are called in to investigate.

Kate Marshall was a promising young police detective when she caught the notorious Nine Elms serial killer. But her greatest victory suddenly became a nightmare. 15 years after those catastrophic, career-ending events, a copycat killer has taken up the Nine Elms mantle, continuing the ghastly work of his idol. Enlisting her brilliant research assistant, Tristan Harper, Kate draws on her prodigious and long-neglected skills as an investigator to catch a new monster. But there's much more than her reputation on the line: Kate was the original killer's intended fifth victim....

When nine-year-old best friends Charlie and Amy disappear, two families are plunged into a living nightmare. A text message confirms the unthinkable; that the girls are the victims of a terrifying kidnapping. And when a second text message pits the two families against each other for the life of their children, the clock starts ticking for D.I. Kim Stone and the squad.