Air date: 2015-01-29

Runtime: 97 min

In the remote Arctic town of Fortitude, two children make a remarkable find, while the discovery of a horrific crime brings a new arrival to the island that complicates Sheriff Dan Anderssen’s investigation.

Air date: 2015-02-05

Runtime: 50 min

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

Air date: 2015-02-12

Runtime: 50 min

Dan and Frank go in search of a suspect; however, Dan's feelings for Elena are threatening to overwhelm him. Morton, meanwhile, uncovers a new piece of evidence.

Air date: 2015-02-19

Runtime: 50 min

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

Air date: 2015-02-26

Runtime: 50 min

Shock waves reverberate around Fortitude as the killer is revealed, while Morton tunes his attention to the death of a scientist on the island months earlier.

Air date: 2015-03-05

Runtime: 50 min

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

Air date: 2015-03-12

Runtime: 50 min

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.

Air date: 2015-03-19

Runtime: 50 min

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.

Air date: 2015-03-26

Runtime: 50 min

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.

Air date: 2015-04-02

Runtime: 50 min

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

Air date: 2015-04-09

Runtime: 50 min

The chilling thriller concludes with a dramatic and emotional finale. Vincent faces a life-threatening situation, while Dan must make a devastating decision.