When Charlie and Susan are sent to stay with their grandmother in the Welsh countryside, they expect quiet days and fresh air, but Brynmoor Cottage is far from peaceful. Strange noises, shifting shadows and eerie whispers unsettle the siblings. After meeting a mysterious women named Sarah, the children are drawn into the village's tragic history and a long-buried secret. As they uncover the truth about the old coal mine and its haunting past, Charlie and Susan realise they must confront their fears to bring peace to those trapped by the shadows of Brynmoor Cottage. A chilling tale of mystery, bravery and the power of the past - where the line between the living and the dead begins to blur.