Summer has arrived in the remote Norwegian Arctic town of Fortitude. It's a happy time for the locals who bask in the hours of daylight. The town, with a population of 713 residents, has no crime and is home to the Arctic Research Centre. The biggest danger is the presence of polar bears requiring anyone going out of town to carry a rifle for their own safety. The local Governor, Hildur Odegard, has plans to open a hotel carved into the local glacier but these are put in doubt when two children discover the remains of what appears to be a mastodon and Professor Charlie Stoddart from the Institute may no longer give the green light to proceed. When Stoddart is found butchered in his house, it is initially thought to be a bear attack but it quickly becomes clear that it's a case of murder. Local resident Henry Tyson, who is dying of liver cancer, is now convinced that a death three months earlier, also reported as a bear attack, was murder and points the finger at Hildur and police Supt... Written by garykmcd

Sheriff Anderssen and the police close in on their murder suspect, while DCI Morton follows a different line of inquiry.

Dan and Frank travel up the coast in search of a suspect; Dan's feelings for Elena threaten to overwhelm him.

Following Dan's loss of control, Morton takes over the murder investigation. Elsewhere, Elena's mysterious past is about to catch up with her.

Everyone is a suspect in the murder of Charlie Stoddard, especially Frank and Elena. The Sheriff seems to have some emotional tie to Elena/Esmerelda, and the truth soon comes to light: she spent 7 years in prison for killing an ex-boyfriend who abused her during their relationship, and the Sheriff handles her case to the extent of providing her with a new identity. Written by starb73

While Morton uncovers new information about the death of Billy Pettigrew, Hildur makes a heart-breaking discovery. Another gruesome event occurs in Fortitude.

Panic sweeps through Fortitude as news of the second attack spreads. Dan and Morton must work together while Frank hopes the latest events will exonerate Liam.

While Frank takes the law into his own hands, DCI Morton closes in on the truth about Pettigrew's death. Vincent and Natalie also make a discovery.

DCI Morton pursues Henry Tyson into the Arctic wilderness in search of the truth, while worrying test results force Governor Odegard to take drastic action.

The truth about Billy Pettigrew is revealed. In the lab, Natalie and Vincent probe the cause of the disturbing events in Fortitude.

Fortitude is a place like nowhere else on Earth. Surrounded by the savage beauty of the polar landscape, its future sparkling with the promise of Arctic opportunity, wealth and discovery, Fortitude is one of the safest towns on earth. There has never been a violent crime here. Until now. Written by Tiger Aspect Productions

Vincent faces a life-threatening situation, while Dan must make a devastating decision.