In utter disbelief Miss Marple read the letter addressed to her from the recently deceased Mr Rafiel - an acquaintance she had met briefly on her travels.
Recognising in Miss Marple a natural flair for justice, Mr Rafiel had left instructions for her to investigate a crime after his death. The only problem was, he had failed to tell her who was involved or where and when the crime had been committed. It was most intriguing.
When it came to solving mysteries, justice was reward enough for Miss Marple.
