The Girl on the Train is the story of Rachel Watson’s life post-divorce. Every day, she takes the train in to work in New York, and every day the train passes by her old house. The house she lived in with her husband, who still lives there, with his new wife and child. As she attempts to not focus on her pain, she starts watching a couple who live a few houses down — Megan and Scott Hipwell. She creates a wonderful dream life for them in her head, about how they are a perfect happy family. And then one day, as the train passes, she sees something shocking, filling her with rage. The next day, she wakes up with a horrible hangover, various wounds and bruises, and no memory of the night before. She has only a feeling: something bad happened. Then come the TV reports: Megan Hipwell is missing. Rachel becomes invested in the case and trying to find out what happened to Megan, where she is, and what exactly she herself was up to that same night Megan went missing.
《列车上的女孩》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。