Twenty-four years ago Katharina Haugen went missing. All she left behind was her husband, Martin, and a mysterious string of numbers scribbled on a piece of paper. Every year on October 9th Chief Inspector William Wisting takes out the files to the case he was never able to solve. Stares at the code he was never able to crack. And visits the husband he was never able to help. But now Martin Haugen is missing too. 

When a body of a woman is discovered at a lighthouse in the Icelandic town of Akranes, it soon becomes clear that she’s no stranger to the area. Chief Investigating Officer Elma, who has returned to Akranes following a failed relationship, and her collegues Sævar and Hörður commence an uneasy investigation which uncovers a shocking secret in the dead woman’s past that continues to reverberate in the present day.

A young man is found brutally murdered, his eyes gouged out. A student of Icelandic history in Reykjavik, he came from a wealthy German family who do not share the police's belief that his drug dealer murdered him. Attorney Thora Gudmundsdottir is commissioned by his mother to find out the truth, with the help—and hindrance—of boorish ex-policeman Matthew Reich. Their investigations into his research take them deep into a grisly world of torture and witchcraft both past and present, as they draw ever closer to a killer gripped by a dangerous obsession.

As a favour, Kate agrees to track down a missing songwriter, Moria Pollock. It was supposed to be a nice simple case, but the search soon leads Kate into the dark underworld of Leeds, Manchester and Bradford – and finally to a shocking confrontation with a killer.

Harry is out of his depth. Detective Harry Hole is meant to keep out of trouble. A young Norwegian girl taking a gap year in Sydney has been murdered, and Harry has been sent to Australia to assist in any way he can. He's not supposed to get too involved. When the team unearths a string of unsolved murders and disappearances, nothing will stop Harry from finding out the truth. The hunt for a serial killer is on, but the murderer will talk only to Harry. He might just be the next victim.

Joseph O'Loughlin appears to have the perfect life—a beautiful wife, a loving daughter and a successful career as a clinical psychologist. But nothing can be taken for granted. Even the most flawless existence is only a loose thread away from unravelling. All it takes is a murdered girl, a troubled young patient and the biggest lie of his life. Caught in a complex web of deceit and haunted by images of the slain girl, he embarks upon a search that will take him from London to Liverpool and into the darkest recesses of the human mind.

A solitary tent is found to contain the body of a half-buried woman. She’s been stoned to death. There are lash marks across her back. One of her hands has been cut off. Two years earlier Internet reporter Henning Juul lost his son, Jonas, in a domestic fire. As he returns to work, physically and emotionally scarred, Henning struggles to escape this past and to be taken seriously again as a reporter.

Ryan Wilkins grew up on a trailer park, a member of what many people would call the criminal classes. As a young Detective Inspector, he's lost none of his disgust with privileged elites - or his objectionable manners. But he notices things; they stick to his eyes. His professional partner, DI Ray Wilkins, of affluent Nigerian London heritage, is an impeccably groomed, smooth-talking graduate of Balliol College, Oxford. You wouldn't think they would get on. They don't. But when a young woman is found strangled at Barnabas Hall, they're forced to. 

It starts with just one body - tortured, mummified and then discarded. Its discovery reveals a nightmare world of hidden lives. Of lost identities, secret rituals and brutal exploitation, where nobody can be trusted. This is the darkest, most complex case the police have ever seen. This is the world of the Crow Girl.

Una knows she is struggling to deal with her father's sudden, tragic suicide. She spends her nights drinking alone in Reykjavik, stricken with thoughts that she might one day follow in his footsteps. So when she sees an advert seeking a teacher for two girls in the tiny village of Skálar - population of 10 - on the storm-battered north coast of the island, she sees it as a chance to escape. But once she arrives, Una quickly realises nothing in city life has prepared her for this. The villagers are unfriendly. The weather is bleak.

Anna Fekete returns to the Balkan village of her birth for a relaxing summer holiday. But when her purse is stolen and the thief is found dead on the banks of the river, Anna is pulled into a murder case. Her investigation leads straight to her own family, to closely guarded secrets concealing a horrendous travesty of justice that threatens them all. How long will it take before everything explodes?

The light spilling in from the corridor would have to do. Though weak, it was sufficient to show Aldís a boy sitting in the gloom at the farthest table. He had his back to her, so she couldn't see who it was but could tell that he was one of the youngest. A chill ran down her spine when he spoke again without turning, as if he had eyes in the back of his head. 'Go away. Leave me alone.' 'Come on. You shouldn't be here.' Aldís spoke gently, fairly sure now that the boy must be delirious. Confused rather than dangerous.

The only witness to a shocking murder is the victim's 10-year-old daughter, Margret. The police turn to the Children's House for their expertise in childhood trauma. The manager, Freyja, doesn't much like the police - especially the detective in charge, Huldar. But she does want to help them protect Margret. And when more people die - their murders heralded by strange messages, texts, and strings of numbers - they will have to work together to crack the riddle before they become targets themselves.

One cold January day the police are called to a sleepy little hamlet in the north of Sweden where they discover a savagely murdered man lying in the snow. As they begin their investigation they notice that the village seems eerily quiet and deserted. Going from house to house, looking for witnesses, they uncover a crime unprecedented in Swedish history. When Judge Birgitta Roslin reads about the massacre, she realises that she has a family connection to one of the couples involved and decides to investigate.

Oslo, 2018. Former long-distance runner Sonja Nordstrøm never shows at the launch of her controversial autobiography, Always Number One. When celebrity blogger Emma Ramm visits Nordstrøm’s home later that day, she finds the door unlocked and signs of a struggle inside. A bib with the number one has been pinned to the TV. Police officer Alexander Blix is appointed to head up the missing-persons investigation, but he still bears the emotional scars of a hostage situation 19 years earlier, when he killed the father of a five-year-old girl.