October, 1922. Ruby Vaughn accompanies her elderly employer, Mr Owen, to Manhurst Castle in the wild Scottish Borders on the pretext of appraising rare manuscripts, but the truth is darker. Haunted by the loss of his son in the Great War, Mr Owen has come seeking contact through a séance led by a mysterious trio known as The Three Fates. However, as the candle smoke from the séance clears, Ruby finds a body and discovers that she and Mr Owen are the prime suspects for the murder. To clear their names, they must unravel buried secrets and confront a killer willing to silence them - forever.