When three innocent children play a game that ends in fatal consequences, it sets in motion a series of events that will haunt their family forever... After the horror of World War One, disillusioned army chaplain John Elliot arrives at Hern Hall, an isolated estate in the English countryside. Shrouded by mist, the mystery of its tragic past seems to haunt the shadows when John glimpses the face of a drowned child beneath the dark waters of the lake. Despite suffering from shellshock, John has made a promise to his friend Will, who died in the trenches whilst saving John's life. It is a promise he is determined to keep. Before being introduced to Will's grieving parents, Lord and Lady Chiddingstone, he first meets Will's sister Lucy, a beautiful, blind and mysterious young woman. After being invited by Lord and Lady Chiddingstone to remain as a guest at Hern Hall, John has a series of unsettling and eerie encounters, even attending a seance conducted by the infamous Madame Blanche, a spiritualist medium whom Lady Chiddingstone hopes can communicate with her dead sons. As John grows closer to the family, he uncovers more about their traumatic past, and the disturbing secrets hiding in the walls and tunnels of Hern Hall. Is the family cursed as an ancient legend tells, and can the ghosts and the living ever find peace, or are they destined to be forever haunted by death?