A letter from beyond the graveOne last requestAn unsolvable crimeWhen Miss Marple receives a letter from the recently deceased millionaire Jason Rafiel, she-s not sure what to make of it.Knowing her deductive skills, he challenges her to solve a crime. If she does so, she will inherit -20,000.The only problem is that he has failed to mention who was involved, or where, and when the crime was committed. Jane Marple is intrigued.Never underestimate Miss Marple-Sorry Poirot, but I-m team Marple every time. A mind to rival the great Sherlock Holmes - and much handier with a knitting needle - yet patronised and underestimated by those around her, her invisibility is her superpower. That and her uncanny understanding of the darkest depths of human nature . . .-Lucy Foley-Her gift is pure genius.-Observer