Mysterious paranormal activities surrounding the hamlet of Heystone are serious enough for Reverend David "Durley" Hudson to investigate the situation. Sinister creatures crawling out of the shadows have been leaving havoc and death in their wake. In contrast, a stern warning from an exorcism in a faraway land also adds an evil ingredient, and links to a phenomenal being known as the War Witch become apparent. After finding a long-hidden diary containing a soldier's dark experience in the First World War, Durley is shocked to the core. A secret in the diary leads to a dilemma even Durley cannot comprehend, and it will be no easy task for him to convince his sister Sarah to help him. But the only way for him to unfold the truth is to enter the hellish world of the War Witch. But her hell does not come alone.