Former special-forces soldier John Gold is given the opportunity to bring Sean Teague – the man who betrayed his team on their final mission in Eastern Europe several years ago – to justice. Gold would cheerfully see Teague dead, but he is convinced to help transport him to a military prison to pay for his crimes. Along the way, Gold will have to fight off Teague’s team who are attempting to extract him, as well as a sniper seemingly hell-bent on killing Teague before he can be secured.

On the orders of their boss, two seasoned contract killers are marching their latest victim to the mob graveyard they have used for several years. When he escapes leaving them no choice but to hunt him through the surrounding forest, they are soon hopelessly lost. As night falls they uncover a dark and terrifying truth about the vast, sprawling woodland, and the hunters become the hunted as they find themselves stalked by an ancient supernatural force.

A group of documentary filmmakers are filming a TV special about the events which occurred at the famous and mysterious abandoned Cain Hill asylum many years earlier, and the unexplained abductions and murders that have occurred at the site since then. The group soon learn that one of the inmates never left Cain Hill at all.