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In the middle of the winter, a small group of scientists in charge of an international base in the Antartica during the long polar nights stops communicating with the outside world.

As the Alexandria threatens to explode, the remaining scientists jump ship and onto the only life boat – putting them face-to-face with the real killer.

As Maggie begins to recount details of how the members of the team were killed, the search team discovers a frozen hand peeking out from the snow near the base.

After another scientist turns up dead, the mole reveals their true identity – and asks for a favor in return.

With Charlie locked up, Amy brings lingering doubts to Wilde, confirming his greatest fears. In the U.K., Olivia and her sister are attacked while plotting their revenge.

After a team member is stung by a scorpion, the others suspect sabotage on the base. Two years earlier, Arthur struggles to gain respect in prison.

Base's supplies are sabotaged. At Portlaoise, Arthur gets a letter from a secret admirer "XX". Distrust mounts over the tampering.

In the lawless desert territory of Bir Tawil, a group of scientists carry out the next phase of Wilde's research: testing the bacteria on humans.

Winter has fallen on the South Pole. A small team, known as the Winterers, will remain at the Polaris VI Antarctic Research Station to continue their innovative research, a crucial part in the fight against climate change. After the winter, Johan Berg returns to base, finding most of the team dead or missing. Only Maggie remained at the station.

Arthur reveals that the body found by the team was that of Sarah Jackson's. Meanwhile, Maggie discloses that Sarah's death was not an accident. She was murdered.