Despite being warned that a group of monkeys about to be released from a lab by some anti-vivisectionists are laced with disease, they let one of them out anyway and next thing it's a month later and "Jim" (Cillian Murphy) wakes up in hospital all by himself. There's not a soul to be seen, anywhere. He can't spend the entire film wandering about naked, so finds some scrubs and goes exploring - gradually gleaning information about the plague that led to the evacuation of the cities and to his current isolation. It's not as if he had anything to do with the release of this virus, but he now has ...