Janet had suspected Seasonal Affective Disorder. The winter blues, caused by lack of sunlight and vitamin D.

Sam was pretty sure that she was depressed this time of year because it was cold. Because she'd never got rid of the chill of past events.

Almost freezing to death in Antarctica. Almost drowning in freezing water.

Painful memories, flirtations with death associated with cold. Winter reminded her of them.

What did they expect from her.

When it snowed, she was back in those caves.

When it rained, she was back in that mothership.

The worst thing was that Jack was there too.