A Shadow on the Wall weaves a chilling tale situated in the Victorian English countryside, where Edward Atherton, a rector devoted to restoring Thornham St. Stephen's ancient church, unwittingly releases a malevolent entity. This entity, long entombed beneath the church, now inflicts terrifying hauntings and mysterious events. Edward recruits Cambridge professor Richard Asquith, an antiquarian, to help dispel the dark forces at play. Their investigation offers only fragments of the tomb's eerie history before escalating circumstances force Asquith to abandon Thornham. Little does he know, the ominous presence has attached itself to him, bringing a trail of death and unexplainable tragedies to his new family. As the evil from the tomb invades his life once more, Asquith is drawn into a terrifying confrontation with the darkness that is determined to destroy him.