Terrible secrets are unearthed in an isolated Icelandic town when the body of an unidentified man is discovered in a fjord. As the hunt for the culprit begins, the town is engulfed by a blizzard, cutting the residents – and potentially the killer – off from the rest of the world.

The storm continues to prevent the police from Reykjavik offering support, so until the blizzard clears, Andri and his colleagues are on their own. Things seem hopeless, but with a suspect in custody, and a body in need of forensic examination, Andri urges his team to prove themselves by making 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.

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.

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.

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 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?

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

Having found the key to the padlock of Hrafn's shed, Andri has a definitive clue to the identity of the murderer, but it's not who he was expecting. The identity of the killer will send shockwaves through the town and Andri faces some very difficult decisions.

After an exhausting and traumatic search, at some personal cost, the local police are finally close to solving the murder that set off the string of terrible events in their little town.