With the arrival of winter at the South Pole, most of the personnel have left the Polaris VI Antarctic Research Station. Only a small team known as the Winterers, led by the renowned biologist Arthur Wilde, remains to continue their innovative research, which plays a crucial role in the fight against climate change. When spring arrives and summer commander Johan Berg returns, he finds that the entire team is either dead or missing. A killer is on the loose, and Johan's wife Annika is missing. To find his wife alive, Johan will have to rely on young doctor Maggie, who appears to be the only survivor left in the group and is dealing with trauma.