One way in, one way out, and nowhere to go.

Shannon is a researcher at an observatory located near Canadian Forces Station Alert, a remote listening post and the northernmost permanently inhabited place in the world. When a visiting reporter falls ill with a mysterious illness, the station gets put on lockdown as the rest of the world deals with the spread of the same strange illness attributed to a new, tropical parasite.

As those around her fall, she must figure out a way to survive in the deep darkness of an arctic winter.