When six high security prisoners escape from Barnaby Prison on the western edge of the Great Dividing Range in southern New South Wales, it will never bode well for anyone they meet. Leaving a trial of destruction behind them, fate seems to direct the steps of the rapists, murderers, hit men and crime bosses towards Hidden Valley, a peaceful close-knit community on the edge of the national park. When confronted with dangers far greater and more sinister than the wild dogs decimating their sheep, the residents of the valley realise that given the right circumstances, anyone can become a killer.