By The Pricking Of My Thumbs: Agatha ChristieTommy and Tuppence IV. When Tommy and Tuppence Beresford visit Aunt Ada an unpleasant old bat at Sunny Ridge Nursing Home, Tuppence encounters some odd residents including Mrs. Lancaster who mystifies her with talk about "your poor child" and "something behind the fireplace". When Aunt Ada dies a few weeks later, she leaves Tommy and Tuppence a painting featuring a house, which Tuppence is sure she has seen before. This realization leads her on a