Two scientists uncover a meteorite impact site in the Arctic tundra, but it kills one scientist and infects the other. A nearby base takes in the lone survivor whilst trying to understand what happened. The lone survivor may not be the person they think she is.
Deep in a wintry forest, an abandoned boy struggles to protect his little sister from an infection that turns people into a feral-like state, a ruthless militia leader searching for his missing daughter, and Government agents hunting them.