In the midst of the Civil War, Confederate soldiers Sergeant William McMasters and Corporal Henry Jessup encounter a runaway slave named Lusinda during their night watch duty. Straying deeper into the woods with her, they soon realize she's a demonic entity set on their demise. As they confront their own guilt and fears, the soldiers must fight to survive the nightmarish encounter in a haunted forest, where history and the supernatural intertwine in a battle for redemption and survival.