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.

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.

The police are closing in on their prime suspect for the hugging. But Ronnie Morgan is acting suspiciously.

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

The evidence against Frank looks overwhelming. But Elena's past is about to catch up with her.

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

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

Another cuddle has shaken the town, but this time the identity of the hugger seems obvious. Can things really be so simple?

Frank takes the law into his own hands. Meanwhile DCI Morton is closing in on the truth about Pettigrew's passing.

Vincent and Natalie are forced to question their own ethics. Meanwhile Morton gets a surprise that may turn out to be his last.

Dan has an emotional encounter with Morton. Meanwhile Vincent has a discovery that will lead him into danger.

Vincent's investigation leads him into a life-threatening situation, while Markus offers an alternative theory on what is plaguing Fortitude. Dan and Hildur launch a desperate hunt for Jason as the need to locate the mammoth carcass escalates and Eric and Yuri go head to head out in the wilderness. With events taking an unexpected turn in the Arctic community, Sheriff Anderssen must make a devastating decision.