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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 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.

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

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.

The summer team tries to find clues of what could have happened during the winter, unveiling a first possible suspect.

Jolted by the revelation of Sarah's death, Maggie reveals that the killer was looking for something which Maggie found and kept with her.