When a cult member is found murdered in a cave, Andri learns he's the same young man he'd been convinced was guilty of a woman's 2013 disappearance.

The arrival of biker-gang reinforcements from Denmark rattles and divides the cult. The police learn how Ívar, the bikers and the cult are connected.

The police interrogate Sverrir but are interrupted. The cult takes a step to ensure its safety. The bikers catch Freyja furtively writing in a notebook.

To get proof of Hopper's connection to the drugs, Sonja sends Sverrir as a mole to the biker gang's warehouse, where Hopper tests his trustworthiness.

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Following a shocking attack on a politician in Reykjavik, Chief of Police Andri makes a return to his rural hometown, a place where the dark events of the past still haunt him.

Andri and Hinrika suspect that two young local farmers, Torfi and Skuli, are implicated in Finnur’s murder.

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When Sverrir disappears, the police begin a search. On probation, Andri visits his mother. Gunnar discovers he's now persona non grata in Hopper's eyes.

Torfi and Skuli remain the best lead for the attack the chief of police is investigating. And Skuli is still on the loose.

The police have foiled a terrorist plot but they’re left no closer to having solved the mystery of who killed Finnur, or why Gisli took the actions he did.

Ketill finds dead animals up by the lake and has his suspicions about why Skuli became so ill hiding out in the mountains. Meanwhile, Ebo is beginning to feel in danger.

Kristján is questioned about his alibi. Andri spots a well-placed security camera. At the wake, the truth behind Ívar's and Lína's deaths is unveiled.

In the aftermath of another killing at the plant, Vikingur is found covered in blood, and with his fingerprints on the murder weapon.

In a small Icelandic fishing port, a ferry docks. That same day a dismembered body is found in the river, sparking an investigation and a call to Reykjavik for detective reinforcements to assist the small local police force. With the ferry held in dock and a bad snowstorm threatening to cut off the town, chief of police Andri is under pressure to deliver results quickly.

With no police support able to arrive from Reykjavik until the snowstorm clears, Andri and his colleagues need to work fast. It seems a hopeless situation, but with a suspect in custody awaiting questioning and a body awaiting forensic tests Andri is desperate for them to prove themselves and make a breakthrough in the case.

The town is still cut off from all help by snowstorms and pack ice, and the local police have somehow managed to lose both the victim's body and the only suspect. Unable to prove his suspicions about the captain of the ferry, Andri finally gets a new lead when people start sharing photos of the corpse online.

The avalanche has caused a total blackout. Plunged into darkness, the town's inhabitants are anxious and afraid. Meanwhile, the mayor has a surprise visitor.

With Skuli now eliminated from its lines of enquiry, and Mayor Hafdis in the clutches of the Hammer of Thor group, has the team lost precious time in its efforts to save Hafdis?

With the murderer still at large, unrest is beginning to grow among the still-trapped townspeople and tourists. The police's list of potential suspects is becoming larger, but with discontent growing and the looming threat of an avalanche above the town, they face a race against time to unravel the mystery.

Amid general disquiet, the town's inhabitants gather in the church, where they demand answers. Police chief Andri Olafsson is tasked with speaking to them and he must tell the truth.

The polluted lake has been discovered and the town's water supply has been turned off to prevent further cases of sickness. Andri and Hinrika are chasing up leads all over town.

The weather is finally improving and the investigation team from Reykjavik arrives. It seems as though real progress is going to be made. But are some things just too good to be true?

Now that Thorhildur has given the police the lead they need, Andri must get her out of town before the killer finds out what has happened.

Captain Carlsen agrees to work with the police. On the ferry, it transpires that one crew member has something to hide.