An unsettling chain of events are set into motion when a group of young friends an visit an abandoned ski resort in the far reaches of Sweden. The remote and neglected Black Lake has been closed for years when Johan invites his friends to stay there. He dreams of reopening the isolated hotel and restoring it to a luxury ski resort, but what begins as a fun research trip soon takes a sinister turn as the group is gripped by a series of unexplained and disturbing events. They soon uncover the real reason Black Lake was abandoned all those years before, and solving the mystery rapidly becomes a matter of life and death.
Hanne, feeling increasingly uncomfortable in the isolated ski resort, tries to find out more about the tragic events that took place there twenty years ago and meets the retired detective who investigated the case. When Johan hears that an anonymous bidder has put an offer in on the property, he doesn’t know who to trust and becomes suspicious of his friends.
Hanne finds a new drawing depicting a death in the lake, together with the recurring message ‘Gäädek Jäämit’ and looks for a local Sami person who can translate it. Jessan is recovering, and hatches a plan to find out what is going on, but it’s not to everyone’s liking. Johan tires of Hanne’s improbable theories, though Jostein seems to be listening to her. But what Hanne not know is that Jostein has his own hidden agenda. Jessan and Hanne get the group to agree to a seance, but it ends in chaos and Jessan disappears. They are then forced to go down into the dark, menacing basement for the first time.
The situation in the isolated ski resort worsens, and Johan finds out who the mystery buyer is. What is the voice that the increasingly confused Jessan is talking about after her experience in the basement? Is it related to the unpleasant message Gäädek Jäämit – kill or be killed? Hanne’s sister Mette is getting tired of Hanne’s conspiracy theories and believes that they are sick fantasies stemming from the childhood trauma of when her little brother Jacob drowned. But Hanne will not listen to Mette and becomes increasingly convinced that there is a supernatural evil threatening their lives. Suspicion grows when Hanne finds an abandoned, secret basement room.
Johan has grand plans for his luxury resort, but as the temperature drops to dangerous levels, he struggles to keep the hotel going without the help of Erkki. Hanne is brutally attacked in the basement but manages to escape, so the group barricade the door. Have they managed to detain a violent killer, and if so who is it? The mystery of what happened to Jessan is making the atmosphere increasingly desperate. Hanne’s wish to leave is ignored when Osvald disappears. Hanne, Mette and Frank leave the facility, but they get stuck and are in danger of freezing to death in the paralysing cold. Johan’s brother Lippi hears sounds that suggest that Osvald may be locked up in the cellar. He finally manages to find a way down and is greeted by…
The theories about who or what is behind the terrible events at Black Lake are sharply divided. Is it an evil curse? Lovers Johan and Hanne are now as far apart as you can get and she clings to Jostein. Hanne finds evidence that the resort’s history is far darker than she first imagined. Meanwhile, Elin’s eye is inflamed and Hanne claims that is a sign of the curse. Does it mean that she has to kill or be killed?
Mette’s suspicions of Dag grow stronger after the fire in the basement, while Hanne is still convinced that the resort is cursed. Johan also finds evidence that the recent events were not accidents. Mette sneaks past Dag and Jostein down into the mysterious basement to find out what’s going on down there. When Johan finds out what is going on, he has only one thought in his mind – revenge.
Hanne asks Jostein what happened and realises that the curse theory might be true. Together with Mette they carry out another seance and Hanne is attacked by a new force. Now, Hanne’s life really is at stake, and she knows that the solution is in the hidden room in the basement. But will she be able to save herself and the others before it is too late?