Darkness: Those Who Kill

Another crime is committed. Frederik is convinced that Bjørn is the perpetrator, but Louise's investigations point to a different suspect. Bjørn turns to Louise and shares a secret with her that might close the case.

The police hunt for Bjørn is intensified. Following a search of Pelle’s home, Frederik and Louise uncover truths about Bjørn’s past, and a decision is reached on the forced removal of Maria’s child.

Louise locates Bjørn’s little sister Maria. Maria's caseworker suggests that Louise mentor the young woman, who is faced with the prospect of having her child taken away from her. Meanwhile, Bjørn is in hiding.

Louise is determined to continue working as a profiler and when a couple is found brutally murdered, she takes on the case. She assists Detective Inspector Frederik Havgaard, who believes he knows who the killer is.

Alice Ejbye receives some bad news from the doctor. At the same time, despite two new victims, the police have yet to find the man who killed her son Markus. Desperate, Alice posts a video on social media offering a reward which has consequences for her relationship with Louise. The police are inundated with information from people who are after the reward, and Karina and Louise struggle to determine whether there is anything useful among all the information. Peter takes his frustration out on his next victim.

Louise Bergstein and Karina Hørup discover that the serial killer has a claimed a new victim, William Fjeldby, who was kidnapped and abducted in his own car. William's father, multimillionaire Gorm Fjeldby, clings to the hope that his son has been kidnapped for a ransom and is therefore still alive. As the police search for William, Peter Vinge tries to celebrate Johannes's birthday without Masja. It dawns on Johannes that his father is hiding something from him.

A young man has been found in the woods, tortured and stabbed to death. Profiler Louise Bergstein and the head of the investigation Karina Horup try to find evidence for whether the murder can be attributed to a serial killer who, after a five-year hiatus, may now be active again. They slowly work their way towards the killer's highly unusual motive. Meanwhile, Peter Vinge struggles with being a single parent to his son, Johannes, and looks for his next victim.

Five years ago, Alice Ejbye's 18-year-old son Markus was murdered by a serial killer who was never found. Alice is now seriously ill and asks criminal profiler, Louise Bergstein, the daughter of her best friend, to help solve the case. At the same time, elsewhere on Funen, a man named Peter Vinge receives a fatal message from his wife Masja.

Louise realises that Anders Kjeldsen does not kill alone but has a partner who is the dominant of the two. In the basement, Emma tries to persuade Stine to help her to escape.

Jan and Louise find an unsolved murder case in Sweden that has similarities with Natasha's, although this one has an unusual signature: the victim's ring finger was cut off. Louise doesn't believe that the murder has been committed by Anders Kjeldsen. Meanwhile, on a farm that Anders Kjeldsen stayed at as a child, the police make a gruesome discovery. Stine is forced to help Anders with the women in the basement, who are planning to escape.

Jan and Louise’s investigation into Natasha’s death leads them to suspect Anders Kjeldsen, a man who has been arrested before for violent crimes including rape. Trapped in a basement, Emma tries to comfort a traumatised Julie, but soon needs comforting herself.

Jan Michelsen is investigating the disappearance of a young woman called Julie Vinding from a Copenhagen suburb. Six months later, Jan is the only one who believes that she is still alive. Jan finds a ten-year-old case from the same neighbourhood where a 17-year-old girl, Natasha, disappeared on her way home from a party. Jan discovers the remains of Natasha in a lake. She was murdered. Suspecting a link between the two crimes, Jan brings in an expert on serial killers, Louise Bergstein.