When Tommy and Tuppence visit an elderly aunt in her gothic nursing home, they think nothing of her mistrust of the doctors. But then Mrs Lockett mentions a poisoned mushroom stew, and they find themselves caught up in an unexpected adventure. An old woman in a nursing home speaks of a child buried behind the fireplace.When Tommy and Tuppence visited an elderly aunt in her gothic nursing home, they thought nothing of her mistrust of the doctors; after all, Ada was a very difficult old lady.But when Mrs Lockett mentioned a poisoned mushroom stew and Mrs Lancaster talked about `something behind the fireplace', Tommy and Tuppence found themselves caught up in an unexpected adventure involving possible black magic.