The newspaper refers to her only as Victim 2117 - the 2117th refugee to die in the Mediterranean Sea. But to three people, the victim is so much more, and her death sets off a chain of events that throws Department Q, Copenhagen's cold cases division led by Detective Carl Mørck, into a deeply dangerous - and deeply personal - case: a case that not only reveals dark secrets about the past, but has deadly implications for the future.

In the middle of a rainy Swedish summer, a little girl is abducted from a crowded train. Despite hundreds of potential witnesses, no one noticed when the girl was taken. Her mother, left behind at the previous station, alerted the crew immediately. But as the train pulled into Stockholm Central Station, the girl was nowhere to be seen.

Fifteen years ago, a teenage girl was assaulted and raped as she picked flowers for a Midsummer's Eve ritual. Cut to the present, and a man is killed in a hit-and-run. He has no identification on him; he is not reported missing or wanted by the police. At the same time, a priest and his wife are found dead in an apparent suicide.

A man, wearing his daughter’s wedding ring, is found in front of his fireplace, a bullet hole in his chest. A funeral director searches desperately for his brother - a man who doesn’t seem to be missed. A woman struggles to protect her children and her life as her husband turns ever more dangerous. Fredrika Bergman and Alex Recht believe that these three cases are totally unrelated...until they uncover a connection between these three people that changes everything. 

Shortly after Inspector Anita Sundström's mother's death, Anita is called to an apartment where an 80-year-old man with dementia has tried to kill his wife. The case sparks off a renewed interest in the death of her father, who was lost in the 1994 MS Estonia ferry disaster. It's not long before she discovers that she's stumbled into a tangled web of conspiracy theories surrounding the tragedy and the unstable and violent dawn of a newly independent Estonia.   

A tragic past. Thirty years ago, the body of a teenage boy was found in Gullspång's lake, and his best friend vanished from her home. Paul Bergman's death was ruled a suicide; Francesca was never found. An unsolved case. Drawn back to Gullspång, Detective Inspector Charlie Lager is haunted by the strange house she knew as a child, and by the missing girl who once lived there. Convinced that the original investigation was flawed, Charlie is determined to uncover what really happened all those decades ago.  

Nora's daughter, Annabelle, has disappeared, last seen on her way home from a party. Gullspång's inexperienced police are wilting under the national media spotlight - and its residents desperate for answers. Stockholm DI Charlie Lager must return home to find Annabelle and then get out of town as soon as she can. Before everyone discovers the truth about her....  

Winter 1999. An old man is driving home when his headlights catch an animal on the empty road up ahead. He stamps hard on the brakes. But it is not an animal at all. It is a young boy, frightened and alone, with a set of deer antlers strapped firmly to his head. Fourteen years later, a body is found in a mountain lake. Within weeks, three people have died. Each time, the killer has left a clue, inviting Special Investigations Detectives Munch and Krüger to play a deadly game - a game they cannot possibly win. Against the most dangerous and terrifying kind of serial killer. 

When a young woman is found dead, the police are quick to respond. But what they find at the scene is unexpected. The body is posed, the scene laboriously set. And there is almost no forensic evidence to be found. Detective Mia Krüger has been signed off work pending psychological assessment. But her boss has less regard for the rules than he should. Desperate to get Mia back in the office, Holger Munch offers her an unofficial deal.

At each abandoned crime scene there's a hidden clue: a tiny metal cog, almost invisible to the naked eye. Someone is sending Detective Sam Berger a message, someone who knows that only he will understand the cryptic trail. When another teenage girl disappears without trace, Sam must convince his superiors that they’re dealing with a serial killer. As the police continue the hunt to find the latest victim, Sam is forced to unearth long-buried personal demons. He has no choice if he is to understand the killer's darkly personal message before time runs out. 

The first the police know of the crime is when clips are sent from the victim's Snapchat account, showing her begging for forgiveness. The CCTV at the cinema where she was working show her being dragged into the night by a masked killer. When the body is found, it is marked with a number 2...Detective Huldar joins the murder investigation, bringing child psychologist Freyja on board to help question the murdered teenager's friends. Soon, they uncover that Stella was far from the angel people claim: a relentless bully, she made life miserable for those around her.

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.

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.

Selma Falck's personal life and career as a lawyer have hit rock bottom. That is until Hege Chin Morell - Norway's best female skier - approaches her desperate to overturn a doping charge. With two months to the Winter Olympics, Selma faces the seemingly almost impossible task of clearing Morell's name. However, when a male skier is found dead after a training accident, it becomes clear to Selma that there is something more serious at risk. Encountering corruption, hidden enmity and shady connections, the pattern of recent crimes and ancient sins becomes undeniable.

When a six-year-old girl is found dead, hanging from a tree, the only clue the Oslo Police have to work with is an airline tag around her neck. It reads, 'I'm travelling alone'. Holger Munch, veteran police investigator, is immediately charged with reassembling his homicide unit. But to complete the team, he must convince his erstwhile partner, Mia Krüger - a brilliant but troubled investigator - to return from the solitary island where she has retreated with plans to take her own life.