《东方快车谋杀案1974》讲述了1930年纽约发生的一起骇人听闻的绑票撕票案，主谋卡塞蒂携赎金逍遥法外。5年后，侦探赫丘里·波罗（艾伯特·芬尼 饰）乘坐东方快车前往伦敦的途中，意外卷入一宗谋杀案

波罗在列车上遇到了一系列可疑的事件。一夜之间，他被隔壁10号包间的叫声惊醒。不久后，因大雪封路，列车被迫停在南斯拉夫境内。凌晨时分，又有一声吵嚷将波罗从梦中唤醒。贵妇哈里特·贝琳达·哈伯德（劳伦·巴考尔 饰）声称富翁雷切特（理查德·威德马克 饰）潜入她的包间。天亮后，雷切特的管家贝多斯（约翰·吉尔古德 饰）来到，但无法打开10号包间的门。列车员皮埃尔·保罗·米歇尔（让-皮埃尔·卡塞尔 饰）用钥匙打开门，却发现门内挂着门链。波罗与皮埃尔合力打开门，惊现雷切特惨死在包间内，口角流血，死状可怖。

波罗决定展开调查，他请来医生康斯坦丁（乔治·库鲁里斯 饰）对遇害者进行检查。结果显示，雷切特身中12刀，死亡时间为午夜时分。这背后是否隐藏着一场精心策划的谋杀阴谋？面对众多疑点和矛盾，波罗展开了他传奇的推理之旅。

"Murder on the Orient Express 1974" tells about a horrific kidnapping and tearing case in New York in 1930. The mastermind, Cassetti, got away with the ransom. Five years later, detective Hercule Polo (played by Albert Finney) is accidentally involved in a murder case on his way to London on the Orient Express

Polo encountered a series of suspicious events on the train. Overnight, he was woken up by the noise from the next room No. 10. Soon after, the train was forced to stop in Yugoslavia due to road closures due to heavy snow. In the early hours of the morning, another loud noise woke Polo from his sleep. Dame Harriet Belinda Hubbard (Lauren Bacall) claims that rich man Ratchett (Richard Widmark) has sneaked into her private room. After daybreak, Ratchett's housekeeper Beddos (played by John Gielgud) arrived, but could not open the door of Room 10. The conductor Pierre-Paul Michel (played by Jean-Pierre Cassel) opened the door with a key, but found a door chain hanging inside the door. Polo and Pierre opened the door together, and found that Ratchett had died tragically in the private room, bleeding from the corners of his mouth, in a horrific death.

Polo decided to investigate, and he invited the doctor Constantine (George Kururis) to examine the victim. The results showed that Ratchett was stabbed 12 times and died at midnight. Is there an elaborate murder conspiracy behind this? Faced with many doubts and contradictions, Polo embarked on his legendary journey of reasoning.