Two days without radio contact, and relations among the Arctic scientists are strained.

“I know at least one of you fuckers is infected,” she says, backing up with the axe. The door’s a foot thick, but the cold still pounds through it.

“Calm down, Jana.” Isolde’s trying to edge around one side. “It’s probably dormant up here–”

“Not in the nice warm lab it’s not!” Jana’s shivering uncontrollably. “Everybody show me your wrists!”

Yarborough goes for the fake-out, but before her eyes snap back he’s leaping. The axe comes down. Jana, like the first scientists, tests her hypothesis in blood.