列车广播三次征集医生，怀有身孕的急诊医生林书晚准备上前施救，却收到警示纸条。跪地求助的男子，正是当年陷害她父亲的仇家。全车乘客指责她冷漠，她选择保持冷静。这是一场精心策划的碰瓷圈套，背后还有泄露行程、煽动网暴的内鬼。林书晚依靠监控与证据，将多年的恩怨逐一厘清，戳破这场蓄谋已久的阴谋。

电影讲述一个刚刚离婚、整天酗酒的伦敦女人蕾切尔（Rachel），她每天早上坐火车都会经过一对夫妻的房子，那对夫妻看上去十分完美，直到有一天蕾切尔发现妻子不见了，蕾切尔怀疑她被人害了，于是开始沉迷于对此事的调查。

While waiting at a train station, Nikki Collins witnesses a murder from a nearby building. When she brings the police to the scene of the crime, they think she's crazy since there's no body. She then enlists a popular mystery writer to help with her sleuthing 猴子到此一游

The story follows a recent divorcee who spends her daily commute fantasizing about a seemingly perfect couple who live in a house that her train passes daily, but something shocking happens there one day.

When documentary filmmaker Danny Hart boards a train at Grand Central Station he has no reason to expect anything more than a pleasant ride to upstate New York to interview the subjects for his latest project. But a chance encounter with a mysterious young woman leads him on a journey of a very different sort. Within the blink of an eye his life of complacency is left behind for a world in which the line between fantasy and reality is blurred...a world of intrigue, danger, and the possibility of blood

生活在伦敦的蕾切尔（艾米丽·布朗特饰）生活是个失败的女人，因为刚刚经历一场婚姻变故的她已然对生活失去了方向，每天除了靠酒精麻醉自己之外，唯…

沈宁在返乡火车上撞破丈夫周屹安的婚外情，过往的付出与深情悉数成空。面对丈夫的偏袒、小三的挑衅和婆家的刁难，她收起软弱奋起反击，凭借智慧拿回属于自己的一切，走出背叛的阴霾后，终在田园生活中遇见良人陈屿，开启崭新人生。

结婚三周年旅途，杨婷婷为私会情人给丈夫下安眠药。夜半丈夫清醒，听清她与旁人的亲密交谈，彻底心死。次日他不动声色调换她的咖啡，出站时拍下二人同行背影发给亲友对峙。见妻子慌乱失措，他直接放下过往，独自换乘列车离开，以淡然姿态做下彻底决裂的反击。