In “Miss Marple: Nemesis,” Agatha Christie's sleuthIn “Miss Marple: Nemesis,” Agatha Christie's sleuth attempts to fulfill the last request of a recently deceased man to look into a possible crime. The problem: She has no clue as to the nature of the crime attempts to fulfill the last request of a recently deceased man to look into a possible crime. The problem: She has no clue as to the nature of the crime.