Miss Marple receives a postcard from the recently deceased Mr. Jason Rafiel, a millionaire whom she had met during a Caribbean holiday and who had been her greatest ally in solving a murder. He has left instructions for investigating an unspecified crime after his death. If she succeeds in solving it, she will inherit £20,000. Mr. Rafiel hasn't provided her with any details, but he has left her instructions to go on a vacation he has planned for her with a tour group traveling by bus through England and visiting historic homes and gardens. Now, Miss Marple is faced with the ultimate crime ... murder. Someone is quite determined that the past should remain buried. Miss Marple must solve a crime that not only has no body, no weapon, and no suspects, but no evidence that a crime has even been committed. All she has to go on is one single word: nemesis.