Three Chicago women have been found strangled, embalmed, and posed as if still alive. Doubting the findings of the local PD’s profiler, the FBI calls on forensic psychologist Zoe Bentley to investigate. Zoe quickly gets off on the wrong foot with her new partner, Special Agent Tatum Gray. Zoe’s a hunter, intense and focused; Tatum’s a smug maverick with little respect for the rules.

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.

Twenty-year-old Kendele Byers is savagely killed and buried in a shallow grave. She had a violent past, a bizarre, kinky line of work, and the suspect list grows longer every day. But when another woman is murdered, Detective Mitchell Lonnie realizes that there's something much more sinister afoot: a connection between the two murders. Both victims had received a clue hinting at their oncoming demise several minutes before they were attacked. There's a serial killer in Glenmore Park.

Every morning and evening, Zoe Walker takes the same route to the train station, waits at a certain place on the platform, finds her favorite spot in the car, never suspecting that someone is watching her. It all starts with a classified ad. During her commute home one night, while glancing through her local paper, Zoe sees her own face staring back at her - a grainy photo along with a phone number and a listing for a website called FindTheOne.com.

It all begins with a call to the police. A 16-year-old boy, Roger Eriksson, has gone missing in the town of Västerås. A search is organized and a group of young scouts makes an awful discovery in a marsh: Roger is dead. Meanwhile, Sebastian Bergman, psychologist, criminal profiler, and one of Sweden's top experts on serial killers, is in Västerås to settle his mother's estate following her death. Sebastian has withdrawn from police work after the death of his wife and daughter in the 2004 tsunami.

In a Stockholm city park, police discover the hideously abused body of a young boy. Detective Superintendent Jeanette Kihlberg heads the investigation, battling an apathetic prosecutor and a bureaucratic police force unwilling to devote resources to solving the murder of a nameless immigrant child. But with the discovery of two more mutilated children's corpses, it becomes clear that a serial killer is at large.

A small-time drug dealer is found battered to death on the outskirts of the Norwegian capital, Oslo. A young Dutchman, walking aimlessly in central Oslo covered in blood, is taken into custody but refuses to talk. When he is informed that the woman who discovered the body, Karen Borg, is a lawyer, he demands her as his defender, although her specialty is civil, not criminal, law. The young man is adamant: he will speak to Karen Borg, and to her alone.

How do you catch a killer who knows your every move? She drew the curtains and returned to the kitchen where she removed the bottle of vodka from the freezer and reached for the large kitchen knife. If he dared to come back, she'd be ready for him. When a body is found hanging in the remains of a dock-side warehouse, detective Kate Matthews is called to the scene.

Freshly trained detective Johannes "Hannes" Niehaus is brand new to the Criminal Investigation Department. And his partner, unconventional veteran detective Fritz Janssen, isn't the least bit thrilled to train a rookie. When a woman's body washes up on the nearby shores of the Baltic Sea, Hannes gets his first taste of real crime - and a chance to prove himself. Quickly the investigation pulls him and Fritz into a whirlpool of dangerous, decades-old cover-ups.

Young, lovely Norwegian Agnes Gerner is waging a dangerous and secret fight. Outwardly, she is a devoted Nazi sympathizer engaged to a prominent businessman. In fact, she is part of an underground resistance doing everything to win the war against the Germans. The only hope she has of being reunited with the man she truly loves - who serves under the code name "Pilgrim" - is if the Nazis are defeated. Of course, there's no guarantee that she'll be alive when that happens....

The only person who might have the answers to a baffling murder case is the victim's seven-year-old daughter, found hiding in the room where her mother died. And she's not talking. Newly-promoted, out of his depth, detective Huldar turns to Freyja for her expertise with traumatized young people. Freyja, who distrusts the police in general and Huldar in particular, isn't best pleased. But she's determined to keep little Margret safe. It may prove tricky. The killer is leaving them strange clues: warnings in text messages, sums scribbled on bits of paper, numbers on the radio.

Ellery Hathaway knows a thing or two about serial killers, but not through her police training. She's an officer in sleepy Woodbury, Massachusetts, where a bicycle theft still makes the newspapers. No one there knows she was once victim number 17 in the grisly story of serial killer Francis Michael Coben. The only victim who lived. When three people disappear from her town in three years, all around her birthday - the day she was kidnapped so long ago - Ellery fears someone knows her secret. Someone very dangerous.

A teacher goes missing under suspicious circumstances and a man is murdered at a local reservoir. For Detective Robyn Carter, there's no obvious link between the cases. But as she starts to delve into them, her investigations lead her to Abigail, perfect wife and mother to beautiful little Izzy. What was Abigail's connection to the victims? And why is she receiving threatening messages from an anonymous number?

On the eve of their thirtieth birthday, twins Jasmine and Nicolas Moretti celebrate late into the night. But when Nicolas wakes several hazy hours later, Jasmine is dead—and he is covered in her blood. Panicking, he takes the murder weapon and runs into the cold Stockholm night. For the police, it’s an open-and-shut case. Nicolas is guilty. And given that he remembers so little of what happened that night, even he isn’t convinced of his innocence.

Pools of blood, scenes of carnage, signs of agonising death - who deals with the aftermath of violence once the bodies have been taken away? Judith Kepler has seen it all. She is a crime-scene specialist. She turns crime scenes back into habitable spaces. She is a cleaner. It is at the home of a woman who has been brutally murdered that she is suddenly confronted with her own past. The murder victim knew Judith's secret: as a child Judith was sent to an orphanage under mysterious circumstances - parentage unknown.