A young woman drowns in 1860. Although it was an accident her death was recorded as suicide, considered to be a mortal sin at the time. Consequently her spirit lives on in a state of torment. Over a century later Tess (Judith Allchurch), a teenager, experiences memories that aren't her own. These nightmarish visions of a drowning woman become too real for comfort and Tess convinces her friend David (Ian Stevens), a fellow history buff, to help her investigate the mysterious death. The pair must prove that the historical suicide was in fact a 'death by accident', in order to free Tess of her horrifying flashbacks. Little do they realise that their findings could also release the tormented spirit and finally let her soul rest in peace.