Murder on the Orient Express delves into the theme of identity and its complexities. The novel presents several characters with diverse backgrounds, cultures, and agendas, each concealing a hidden identity or bearing secrets. Poirot, the detective, must look beyond the surface to determine the true characters and motivations of the passengers.
The theme of justice also plays a significant role in the story. Poirot seeks not only to solve the crime but also to ensure justice is served. The passengers face an ethical dilemma when they come together to decide the murderer's fate. They must determine whether to follow strict legal procedures or take matters into their own hands to achieve a sense of justice that they believe is necessary.
The novel raises intriguing questions about the complexities of human identity, the ambiguity of morality, and the quest for truth and fairness.