I Have Always Been Ready To Go

While secluded alone inside a cabin in the woods with nothing but a battery-powered radio for entertainment, a young man finds himself present with a worldwide unexplained phenomenon of doppelgangers attacking and killing their true selves before disappearing with no trace left behind.

But before the young man can even consider making it out alive, he hears a chilling knock on the door, beginning his fight for survival with the person on the other side.