M' M for Murder is a classic mystery novel written by Agatha Christie and first published in 1939. The novel follows the story of a young woman, Kay, who is accused of murdering her uncle. The novel is set in England and features a cast of characters including a detective, a lawyer, and a doctor. The crossword solution for the term 'M for Murder' is DIAL, which is an acronym for Detective Inspector Arthur Lane. Detective Inspector Arthur Lane is the main character in the novel and is tasked with solving the murder.