Crime fiction has long served as a literary medium through which society examines the complexities of justice, morality, and criminal behaviour. Agatha Christie’s Murder on the Orient Express is one of the most influential works of detective fiction, as it presents a multifaceted narrative that challenges traditional notions of crime and punishment. The narrative revolves on the murder of Samuel Ratchett, who is progressively revealed to be the criminal responsible for the Armstrong kidnapping tragedy as the investigation progresses. The plot takes place on the luxury Orient Express. Christie moves beyond the traditional structure of detective fiction by introducing moral ambiguity and collective responsibility into the framework of crime. This paper examines how the novel narrates crime not merely as an act of individual deviance, but as a result of social injustice and emotional Trauma. The investigation conducted by the celebrated detective Hercule poirot ultimately reveals that the murder was a collective act carried out by individuals connected to Armstrong family. Their actions emerge from a shared sense of injustice following the failure of legal institutions to punish the original perpetrator. The film Murder on the Orient Express has been the subject of numerous cinematic adaptations that visually reinterpret it’s central themes of crime and justice, as a result of its enduring popularity. These adaptions expand the ethical and emotional dimension of Christie’s narrative by converting it into visual medium, these adaptations extend the ethical and emotional dimensions of the story, enabling audiences to engage more directly with the moral complexities surrounding criminal behaviour and retributive justice.