The film inspired a 2002 Hollywood remake in English.
When 17-year-old Tanja is found murdered in the city of Tromsø, far up in the Norwegian Arctic, Kripos police officers Jonas Engström (Stellan Skarsgård) and Erik Vik (Sverre Anker Ousdal) are called in to investigate. Engström is a police inspector formerly with the Swedish police who moved to Norway after being caught having sex with the main witness in one of his cases. Vik is nearing retirement age, and his memory is failing.
Engström devises a plan to lure the murderer back to the scene of the crime, but the stakeout is blown and the murder suspect flees into the fog. Events take a turn for the worse when the fugitive shoots one of the pursuing unarmed Norwegian police officers. Without telling his colleagues, however, Engström carries a gun from his days in the Swedish police, who routinely carry firearms. While shooting at what he believes to be the suspect, Engstrom accidentally kills Vik, who had mistakenly run right instead of left as ordered.
Engström initially tells the truth about the shooting, but realizes that everyone assumes that the fugitive shot Vik. He decides to conceal his culpability. When one of his colleagues, Hilde Hagen (Gisken Armand), is assigned to investigate Vik's death, Engström becomes worried about ballistic fingerprinting and tampers with evidence to support his story. Haunted by guilt and unable to sleep with the midnight sun of the Arctic, Engström becomes increasingly unhinged and starts hallucinating about Vik. Things become even worse when he learns that Tanja's murderer saw him shoot Vik.
Engström learns from one of Tanja's friends that she had been seeing Jon Holt (Bjørn Floberg), a crime novelist. He correctly deduces that Holt killed Tanja, but Holt blackmails Engström with his knowledge of the Vik shooting. The two meet and decide to frame Tanja's boyfriend Eilert for her murder, with Engström later planting Holt's gun under Eilert's bed. However, Hagen is not convinced of Eilert's involvement, and when new evidence emerges, Engström knows that it's only a matter of time until Holt is arrested.
Engström tracks down Holt in some rotting wooden buildings at the waterfront and tries to talk with him. Holt suspects that Engström has come to kill him and holds him at gunpoint. He explains how he killed Tanja in a fit of rage when she rejected his advances. Holt tries to flee across a pier, but the rotten floorboards give way and he falls into the water below, striking his head on the way. He drowns as Engström watches. When he rummages through Holt's nearby house, Engström finds Tanja's dress, which Holt had removed before dumping the body. With Holt dead, and this definitive proof that he was the murderer, the case is closed.
Just before he leaves town, Engström is visited by Hagen, who shows him a cartridge case found at the site where Vik was shot. She notes that it is a Norma case, which Engström confirms is a brand used by the Swedish police. Engström expects Hagen to arrest him, but instead she simply places the cartridge case on a table and leaves. Engström drives out of town, his face and eyes showing great weariness; he seems not to have recovered from his insomnia.Stellan Skarsgård as Jonas EngströmSverre Anker Ousdal as Erik VikBjørn Floberg as Jon HoltGisken Armand as Hilde HagenMaria Bonnevie as AneBjørn Moan as EilertMaria Mathiesen as Tanja LorentzenMarianne O. Ulrichsen as FrøyaKristian Figenschow as Arne ZakariassenThor Michael Aamodt as Tom EngenFrode Rasmussen as Chief of Police
The film has been widely praised as a psychological study and "semi-noir". Roger Ebert of the Chicago Sun-Times compared it to the Dostoyevsky novel Crime and Punishment. For the New York Times, Janet Maslin praised the principal performance by Skarsgård and added that "Mr. Skjoldbjærg's understated, elliptical direction keeps the material dangerous and volatile, with frequent small touches of the unexpected as Engstrom shows increasing signs of strain."
A remake of the film was directed by Christopher Nolan. The film, featuring Al Pacino, Robin Williams, and Hilary Swank, was released in 2002.