A wealthy woman holds a party at her Devon estate for family and friends, including old schoolmate Miss Marple. When a solicitor and the hostess herself are both murdered, Miss Marple tries to find a clever killer with a devious plan.
Miss Marple and her nephew, novelist Raymond West, embark on a coach tour of historic English houses with an eclectic group of characters at the behest of a late friend who had knowledge of an unsolved murder.
Miss Marple's friend - a Catholic priest - is battered to death after visiting a woman dying under strange circumstances. Seeking justice, she becomes entangled in a nefarious organization centered around an inn run by purported witches.