When Detective Natalie Ward is called to the home of 14-year-old Roxy Curtis she can’t help but empathise with Roxy’s distraught mother Cathy. Roxy hasn’t come home, last seen heading next door for a sleepover with her best friend Ellie. As the mother of two teenagers herself, Natalie knows that this is every parent’s worst nightmare. But when Roxy’s body is found in the basement of a beautiful Victorian mansion on the other side of town, Natalie’s darkest fears are confirmed. What was Roxy doing there? Cathy seems evasive, and Ellie refuses to talk.

When the body of mother Charlotte Brannon is discovered by her husband, Adam, in their bedroom, Detective Natalie Ward is first on the scene. The killer has left a chilling calling card: The word Why? written on the wall in blood. As Natalie begins to delve deeper into the couple’s lives, she discovers that Adam has a dark past he’s been hiding, and she’s sure that the Brannons' teenage babysitter, Inge, has secrets of her own.

One beautiful summer’s evening, thirteen-year-old twins Ivy and Erin Westmore snuggle down in a tent in their back garden, giggling and sharing secrets. When their mother goes to wake the girls the next morning, their tent is empty. The alarm is raised, and Detective Natalie Ward is put onto the case. When the twins’ bodies are discovered on nearby marshland, covered with deep pink petals, an icy shiver travels down Natalie’s spine. Everything about the girls’ deaths reminds her of a horrifying case she worked on earlier in her career.

Sasha’s 18-year-old daughter Gemma was all she had in the world. Sasha fell pregnant with Gemma when she was still at school, and the two are as close as sisters. So when Gemma’s burned and broken body is found, Sasha’s world ends. Leading the case is Detective Natalie Ward, scarred by her own recent tragedy. When she finds a note in Gemma’s diary from "a secret admirer", she moves quickly, determined to unmask them. But interviews with Gemma’s devastated ex-boyfriend and her charismatic teacher don’t give Natalie the answers she’d hoped for....

When the frail body of a teenage girl is discovered strangled in a parking lot, shards of ice form in Detective Natalie Ward’s veins. As Natalie looks at the freckles scattered on her cheeks and the pale pink lips tinged with blue, she remembers that this innocent girl is somebody’s daughter. The girl is identified as missing teenager Amelia Saunders, who has run away from home and her controlling father. Natalie’s heart sinks further when it becomes clear that Amelia has been working on the streets, manipulated by her violent new boyfriend, Tommy. 

In Broken Harbour, a ghost estate outside Dublin - half-built, half-inhabited, half-abandoned - two children and their father are dead. The mother is on her way to intensive care. Scorcher Kennedy is given the case because he is the Murder squad's star detective. At first he and his rookie partner, Richie, think this is a simple one: Pat Spain was a casualty of the recession, so he killed his children, tried to kill his wife Jenny, and finished off with himself.

On a hot summer’s morning, a young father is found murdered in a cornfield outside the quiet town of Colton, tied to a post, arms spread wide. Detective Robyn Carter is reminded of the crucifixion, and she knows she’s looking for a killer with a twisted sense of right and wrong. Robyn vows she will find the killer - no matter what. But then a local doctor - a popular woman with a young family of her own - is found dead outside her surgery. There are similarities between the first body and hers, and Robyn must take another look at the picture-postcard town, where no one has any enemies.

In the darkness of a cold December morning, Detective Kim Stone steps through the doors of Halesowen Police Station. She’s about to meet her team for the first time. When the body of a young man is found beheaded and staked to the ground in a secluded area of the Clent Hills, Kim and her new squad rush to the crime scene. This audio edition includes exclusive bonus content.

The boy studied the bruise turning yellow at the base of his neck. With quick fingers his mother tightened his tie and pulled his collar high above it. Her eyes alone said, We will not speak of this.... Years later a man is found shot dead in a local park. On his phone is a draft text: I can’t keep this secret any longer. The recipient is unnamed. Detective Robyn Carter knows this secret is the key to the case, but his friends and family don’t offer any clues, and all her team have to go on is a size-ten footprint.

On a remote Highland mountain, the body of Elaine Buxton is burning. All that will be left to identify the respected lawyer are her teeth and a fragment of clothing. In the concealed back room of a house in Edinburgh, the real Elaine Buxton screams into the darkness…. Detective Inspector Luc Callanach has barely set foot in his new office when Elaine’s missing persons case is escalated to a murder investigation. Having left behind a promising career at Interpol, he’s eager to prove himself to his new team.

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.

There's no easy way to die.... Unknown to DI Luc Callanach and the newly promoted DCI Ava Turner, a serial killer has Edinburgh firmly in his grip. The killer is taking his victims in the coldest, most calculating way possible - engineering slow and painful deaths by poison, with his victims entirely unaware of the drugs flooding their bloodstream until it's too late.

When a young mother is found drowned in the bath, clutching a receipt saying 'all debts paid', Detective Robyn Carter knows it's just the beginning of a harrowing case. She recognizes the signs of a serial killer, and when a second victim with a receipt is found, her worst fears are confirmed. With the local press whipping the public into a frenzy, Robyn is under pressure to solve the crime yesterday. But her team can't find a link between the two bodies, and the cracks are starting to show.

When a girl's body is found at a Midlands storage unit, it is too decomposed for Detective Robyn Carter to read the signs left by the killer. No one knows the woman in blue who rented the unit; her hired van can't be traced. But as the leads run dry, another body is uncovered. This time the killer's distinctive mark is plain to see, and matching scratches on the first victim's skeleton make Robyn suspect she's searching for a serial killer.

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.