Sanna discovers the truth about her missing father's fate, and that it's all connected to the icebreaker crew. Sanna must face her greatest challenge and end it all through personal sacrifice. What will remain of them, and who will make it back to dry land alive?

The survivors take refuge on Burnhill Island. To Sanna's horror, she witnesses a vision that shouldn't be possible. Sanna realizes she has a deeper connection to the mysterious events than she realizes, and that the myth of an ancient spirit may be real.

The crew attempts to fix the icebreaker's engine, with disastrous consequences. Something keeps attacking them. With no other options, they must evacuate across the ice. There, Sanna encounters someone who should be dead, and an invisible force pulls a crew member into the fog.

The night turns eerie and dark. One crew member accidentally shoots another, while two others disappear. A disturbing and malicious presence seems to be affecting everyone. The crew plans an escape on the hovercraft, but disaster strikes.

Sanna is determined to find the chief engineer, while the crew plans a way out of the stranded icebreaker, as no one seems to be coming to their rescue. Meanwhile, Sanna sets out on foot to search for a missing crew member who stole her hovercraft.

Coast Guard officers Sanna Tanner and Joonas Kapanen are trapped on an icebreaker during a rescue operation. The crew seems paranoid and secretive. When the chief engineer attacks Joonas, Sanna rushes to his aid, with deadly consequences.