Rachel Watson's story is The Girl on the Train, which tells the tale of her life after divorce. She takes the train to New York every day and passes her house each day. She lived there with her husband and their child. She tries to ignore her pain and instead watches a couple living a few doors down, Megan Hipwell and Scott Hipwell. In her mind, she creates an idyllic dream world for them about their perfect happy family. One day as she is riding the train, she witnesses something that shocks her and it fills her with anger. She wakes up the next morning with an awful hangover and numerous wounds and bruises. It is a gut feeling that something terrible has happened to her. Megan Hipwell goes missing. Rachel is now involved in this case, trying to figure out where Megan is and what she was doing that night Megan disappeared.