Two sisters must face a new reality — and supernatural elements — when it's revealed their parents participated in a cult ritual ending in death.

Winter has hit the South Pole, which means that the sun will soon set for the next six months. A number of scientists remain at the Polaris VI station to continue their research. After the winter, Johan Berg returns to base, finding most of the team dead or missing. Maggie is the only one found at the station alive.