Compared with the original novel, the movie has reduced many details and clues about solving the case, and has also changed a lot of characters.
Detective Polo in the movie lacks the cuteness in the novel, and has a serious and dignified expression from beginning to end. But this adaptation is in line with the two plots set at the beginning of the film. The suicide of the perpetrator and the lynching of the adulterous woman must have stirred some doubts and reflections in Polo's mind about the relationship between justice and the law, which prevented him from boarding the train with ease. And then, he encountered the murder of the Orient Express, which also triggered the debate about law and justice after the case was solved.
As a detective, it is also his responsibility to solve the case, which is in line with his nature, and requires absolute rationality. But being human is not immune to the influence of other people and things, not to mention a murder called "justice". I don't know if it would have been easier to make the final decision if Polo was not religious. But at the end of the film, Polo, who holds his faith tightly and drags his squat body to walk alone in the snow, is really distressing and respectful.
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