The worst crime that ever happens in the picturesque village of Netherwell is the occasional burglary, but that is all about to change.
Dennis Dean takes his dog for a walk, unaware of the danger lurking in the woods. When he fails to answer his mobile phone, his wife, Alice, becomes concerned. Her fears are exacerbated after their dog returns home without its master.
Over the course of the next two days, the once peaceful location is rocked by a series of horrific murders and descends into a spiral of escalating violence.
But the ancient evil hiding beneath the trees may not be the only source of danger. As the residents battle to stay alive, they begin to question the motives of those whose duty it is to protect them.